Assertion failed: controller.[[queue]] is empty.

==== JS stack trace =========================================

Security context: 0x1a5632c400e9 <String[29]: http://web-platform.test:8001>
    2: logStackTrace [native prologue.js:1] [bytecode=0x28c3299c4b89 offset=4](this=0x1a5632c16d61 <Object map = 0x24e3e11d849>#0#)
    4: TEMP_ASSERT(aka TEMP_ASSERT) [native WritableStream.js:112] [bytecode=0x28c329996351 offset=55](this=0x1bb86a82311 <undefined>,predicate=0x1bb86a82421 <false>,message=0x28c3299c3f61 <String[30]: controller.[[queue]] is empty.>)
    6: WritableStreamDefaultControllerProcessClose(aka WritableStreamDefaultControllerProcessClose) [native WritableStream.js:633] [bytecode=0x28c3299c4271 offset=169](this=0x1bb86a82311 <undefined>,controller=0x357075be9e69 <WritableStreamDefaultController map = 0x24e3e136341>#1#)
    8: WritableStreamDefaultControllerAdvanceQueueIfNeeded(aka WritableStreamDefaultControllerAdvanceQueueIfNeeded) [native WritableStream.js:616] [bytecode=0x28c3299997c9 offset=206](this=0x1bb86a82311 <undefined>,controller=0x357075be9e69 <WritableStreamDefaultController map = 0x24e3e136341>#1#)
   10: onFulfilled(aka onFulfilled) [native WritableStream.js:532] [bytecode=0x28c32999ac81 offset=58](this=0x1bb86a82311 <undefined>)
   11: arguments adaptor frame: 1->0
   12: /* anonymous */(aka /* anonymous */)(this=0x1bb86a82311 <undefined>)

==== Details ================================================

[2]: logStackTrace [native prologue.js:1] [bytecode=0x28c3299c4b89 offset=4](this=0x1a5632c16d61 <Object map = 0x24e3e11d849>#0#) {
  // expression stack (top to bottom)
  [00] : 0x1a5632c170f1 <JSFunction logStackTrace (sfi = 0x1bb86a89871)>#2#
--------- s o u r c e   c o d e ---------
function logStackTrace(){\x0a%DebugTrace();\x0a}
-----------------------------------------
}

[4]: TEMP_ASSERT(aka TEMP_ASSERT) [native WritableStream.js:112] [bytecode=0x28c329996351 offset=55](this=0x1bb86a82311 <undefined>,predicate=0x1bb86a82421 <false>,message=0x28c3299c3f61 <String[30]: controller.[[queue]] is empty.>) {
  // stack-allocated locals
  var /* anonymous */ = 0x1bb86a82311 <undefined>
  var WritableStreamInternalError = 0x1bb86a82311 <undefined>
  // expression stack (top to bottom)
  [07] : 0x1bb86a82311 <undefined>
  [06] : 0x1bb86a82311 <undefined>
  [05] : 0x357075beb711 <String[49]\: Assertion failed: controller.[[queue]] is empty.\n>
  [04] : 0x1a5632c16d61 <Object map = 0x24e3e11d849>#0#
  [03] : 0x1a5632c170f1 <JSFunction logStackTrace (sfi = 0x1bb86a89871)>#2#
  [02] : 0x1bb86a82351 <the_hole>
--------- s o u r c e   c o d e ---------
function TEMP_ASSERT(predicate, message) {\x0a    if (predicate) {\x0a      return;\x0a    }\x0a    v8.log(`Assertion failed: ${message}\n`);\x0a    v8.logStackTrace();\x0a    class WritableStreamInternalError extends Error {\x0a      constructor(message) {\x0a        super(message);\x0a      }\x0a    }\x0a    throw new WritableStreamInternalError(mes...

-----------------------------------------
}

[6]: WritableStreamDefaultControllerProcessClose(aka WritableStreamDefaultControllerProcessClose) [native WritableStream.js:633] [bytecode=0x28c3299c4271 offset=169](this=0x1bb86a82311 <undefined>,controller=0x357075be9e69 <WritableStreamDefaultController map = 0x24e3e136341>#1#) {
  // stack-allocated locals
  var sinkClosePromise = 0x1bb86a82351 <the_hole>
  // heap-allocated locals
  var controller = 0x357075be9e69 <WritableStreamDefaultController map = 0x24e3e136341>#1#
  var stream = 0x357075be9d09 <WritableStream map = 0x24e3e135689>#3#
  // expression stack (top to bottom)
  [07] : 0x1bb86a82311 <undefined>
  [06] : 0x1bb86a82311 <undefined>
  [05] : 0x28c3299c3f61 <String[30]: controller.[[queue]] is empty.>
  [04] : 0x1bb86a82421 <false>
  [03] : 0x1bb86a82311 <undefined>
  [02] : 0x357075bae541 <JSFunction TEMP_ASSERT (sfi = 0x325d6a65fbf9)>#4#
  [01] : 0x357075b9b121 <FixedArray[105]>#5#
--------- s o u r c e   c o d e ---------
function WritableStreamDefaultControllerProcessClose(controller) {\x0a    const stream = controller[_controlledWritableStream];\x0a    TEMP_ASSERT(stream[_state] === CLOSING,\x0a                'stream.[[state]] is "closing".');\x0a    DequeueValueForController(controller);\x0a    TEMP_ASSERT(controller[_queue].length === 0,\x0a                'controller.[[queue]] is...

-----------------------------------------
}

[8]: WritableStreamDefaultControllerAdvanceQueueIfNeeded(aka WritableStreamDefaultControllerAdvanceQueueIfNeeded) [native WritableStream.js:616] [bytecode=0x28c3299997c9 offset=206](this=0x1bb86a82311 <undefined>,controller=0x357075be9e69 <WritableStreamDefaultController map = 0x24e3e136341>#1#) {
  // stack-allocated locals
  var state = 1
  var writeRecord = 0x1bb86aa5319 <String[5]: close>
  // expression stack (top to bottom)
  [05] : 0x1bb86a82311 <undefined>
  [04] : 0x357075be9f69 <SimpleQueue map = 0x24e3e135161>#6#
  [03] : 0x1bb86a82311 <undefined>
  [02] : 0x357075bae9c1 <JSFunction WritableStreamDefaultControllerProcessClose (sfi = 0x325d6a661389)>#7#
--------- s o u r c e   c o d e ---------
function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {\x0a    const state = controller[_controlledWritableStream][_state];\x0a    if (state === CLOSED || state === ERRORED) {\x0a      return;\x0a    }\x0a    if (!getDefaultControllerStartedFlag(controller)) {\x0a      return;\x0a    }\x0a    if (getDefaultControllerWritingFlag(controller)) {\x0a      return;\x0a    }\x0a...

-----------------------------------------
}

[10]: onFulfilled(aka onFulfilled) [native WritableStream.js:532] [bytecode=0x28c32999ac81 offset=58](this=0x1bb86a82311 <undefined>) {
  // expression stack (top to bottom)
  [03] : 0x1bb86a823b1 <true>
  [02] : 0x357075be9e69 <WritableStreamDefaultController map = 0x24e3e136341>#1#
  [01] : 0x1bb86a82311 <undefined>
  [00] : 0x357075bae931 <JSFunction WritableStreamDefaultControllerAdvanceQueueIfNeeded (sfi = 0x325d6a6611e9)>#8#
--------- s o u r c e   c o d e ---------
function onFulfilled() => {\x0a        setDefaultControllerStartedFlag(controller, true);\x0a        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\x0a      }
-----------------------------------------
}

[11]: arguments adaptor frame: 1->0 {
  // actual arguments
  [00] : 0x1bb86a82311 <undefined>  // not passed to callee
}

[12]: /* anonymous */(aka /* anonymous */)(this=0x1bb86a82311 <undefined>) {
// optimized frame
--------- s o u r c e   c o d e ---------
<No Source>
-----------------------------------------
}
==== Key         ============================================

 #0# 0x1a5632c16d61: 0x1a5632c16d61 <Object map = 0x24e3e11d849>
 #1# 0x357075be9e69: 0x357075be9e69 <WritableStreamDefaultController map = 0x24e3e136341>
 #2# 0x1a5632c170f1: 0x1a5632c170f1 <JSFunction logStackTrace (sfi = 0x1bb86a89871)>
 #3# 0x357075be9d09: 0x357075be9d09 <WritableStream map = 0x24e3e135689>
        controller: 0x357075be9e69 <WritableStreamDefaultController map = 0x24e3e136341>#1#
            events: 0x357075bea359 <JSArray[0]>#9#
 #4# 0x357075bae541: 0x357075bae541 <JSFunction TEMP_ASSERT (sfi = 0x325d6a65fbf9)>
 #5# 0x357075b9b121: 0x357075b9b121 <FixedArray[105]>
                 0: 0x357075badfd1 <JSFunction (sfi = 0x325d6a65f239)>#10#
                 1: 0x1a5632c02201 <FixedArray[259]>#11#
                 3: 0x1a5632c02201 <FixedArray[259]>#11#
                 4: 0x1a5632c16d61 <Object map = 0x24e3e11d849>#0#
                 5: 0x1a5632c172e9 <Object map = 0x24e3e123bf9>#12#
                 6: 0x1a5632c39d69 <Symbol: [[pendingWriteRequest]]>#13#
                 7: 0x1a5632c39da1 <Symbol: [[pendingCloseRequest]]>#14#
                 8: 0x1a5632c39dd9 <Symbol: [[pendingAbortRequest]]>#15#
                 9: 0x1a5632c39e11 <Symbol: [[state]]>#16#
                  ...
 #6# 0x357075be9f69: 0x357075be9f69 <SimpleQueue map = 0x24e3e135161>
             front: 0x357075be9fa1 <Object map = 0x24e3e135001>#17#
              back: 0x357075be9fa1 <Object map = 0x24e3e135001>#17#
            cursor: 1
              size: 1
 #7# 0x357075bae9c1: 0x357075bae9c1 <JSFunction WritableStreamDefaultControllerProcessClose (sfi 