Errors when opening Firefox tabs, navigating Explorer, etc.: Dynamic_MultitaskingViewFrameListItemListItemUIA' object has no attribute 'IAccessibleObject

[XLTechie]

Steps to reproduce:

Install or run latest alpha.
Open one or more pages in Firefox.

Alternate:
Open Windows Explorer, and move up and down a file list.

Actual behavior:

Upon opening a new page, changing tabs, or changing windows, Multiple error sounds play, and a chain of exceptions is shown in the log:

ERROR - api.setFocusObject (01:24:28.593) - MainThread (7352):
Error updating tree interceptor
Traceback (most recent call last):
  File "api.pyc", line 139, in setFocusObject
  File "treeInterceptorHandler.pyc", line 33, in update
  File "NVDAObjects\__init__.pyc", line 389, in _get_treeInterceptor
  File "treeInterceptorHandler.pyc", line 25, in getTreeInterceptor
  File "virtualBuffers\gecko_ia2.pyc", line 226, in __contains__
  File "virtualBuffers\gecko_ia2.pyc", line 185, in _iterIdsToTryWithAccChild
AttributeError: 'Dynamic_MultitaskingViewFrameListItemListItemUIA' object has no attribute 'IAccessibleObject'
ERROR - eventHandler.executeEvent (01:24:28.645) - MainThread (7352):
error executing event: foreground on <NVDAObjects.UIA.UIA object at 0x072A13B8> with extra args of {}
Traceback (most recent call last):
  File "eventHandler.pyc", line 246, in executeEvent
  File "eventHandler.pyc", line 96, in __init__
  File "eventHandler.pyc", line 103, in next
  File "eventHandler.pyc", line 131, in gen
  File "NVDAObjects\__init__.pyc", line 389, in _get_treeInterceptor
  File "treeInterceptorHandler.pyc", line 25, in getTreeInterceptor
  File "virtualBuffers\gecko_ia2.pyc", line 226, in __contains__
  File "virtualBuffers\gecko_ia2.pyc", line 185, in _iterIdsToTryWithAccChild
AttributeError: 'UIA' object has no attribute 'IAccessibleObject'
DEBUGWARNING - NVDAObjects.UIA.UIA._prefetchUIACacheForPropertyIDs (01:24:28.669) - MainThread (7352):
IUIAutomationElement.buildUpdatedCache failed given IDs of {30019, 30086, 30022, 30025, 30155, 30036, 30070, 30103, 30008, 30009, 30010, 30046, 30079}
DEBUGWARNING - eventHandler.executeEvent (01:24:28.675) - MainThread (7352):
error executing event: gainFocus on <NVDAObjects.Dynamic_MultitaskingViewFrameListItemListItemUIA object at 0x0711F238> with extra args of {}
Traceback (most recent call last):
  File "eventHandler.pyc", line 246, in executeEvent
  File "eventHandler.pyc", line 96, in __init__
  File "eventHandler.pyc", line 105, in next
  File "appModules\explorer.pyc", line 415, in event_gainFocus
  File "eventHandler.pyc", line 105, in next
  File "NVDAObjects\UIA\__init__.pyc", line 1142, in event_gainFocus
  File "NVDAObjects\__init__.pyc", line 1137, in event_gainFocus
  File "NVDAObjects\__init__.pyc", line 1005, in reportFocus
  File "speech\__init__.pyc", line 449, in speakObject
  File "speech\__init__.pyc", line 491, in getObjectSpeech
  File "speech\__init__.pyc", line 355, in getObjectPropertiesSpeech
  File "baseObject.pyc", line 42, in __get__
  File "baseObject.pyc", line 146, in _getPropertyViaCache
  File "NVDAObjects\UIA\__init__.pyc", line 1599, in _get_rowNumber
  File "NVDAObjects\UIA\__init__.pyc", line 839, in _getUIACacheablePropertyValue
  File "comtypesMonkeyPatches.pyc", line 27, in __call__
_ctypes.COMError: (-2147220991, 'An event was unable to invoke any of the subscribers', (None, None, None, 0, None))
ERROR - eventHandler.executeEvent (01:24:28.682) - MainThread (7352):
error executing event: UIA_window_windowOpen on <appModules.explorer.MultitaskingViewFrameWindow object at 0x072D3B80> with extra args of {}
Traceback (most recent call last):
  File "eventHandler.pyc", line 246, in executeEvent
  File "eventHandler.pyc", line 96, in __init__
  File "eventHandler.pyc", line 105, in next
  File "appModules\explorer.pyc", line 439, in event_UIA_window_windowOpen
  File "eventHandler.pyc", line 103, in next
  File "eventHandler.pyc", line 131, in gen
  File "NVDAObjects\__init__.pyc", line 389, in _get_treeInterceptor
  File "treeInterceptorHandler.pyc", line 25, in getTreeInterceptor
  File "virtualBuffers\gecko_ia2.pyc", line 226, in __contains__
  File "virtualBuffers\gecko_ia2.pyc", line 185, in _iterIdsToTryWithAccChild
AttributeError: 'MultitaskingViewFrameWindow' object has no attribute 'IAccessibleObject'

Expected behavior:

No error sounds, no errors.

System configuration

NVDA

Installed, alpha-22148,9a1cca54

Windows version:

20H2 (OS Build 19042.867)

Name and version of other software in use when reproducing the issue:

Firefox 87.0 (64 bit)

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

An earlier alpha from today didn't do this.
2019.3.1 doesn't do this.

If add-ons are disabled, is your problem still occurring?

Yes

Did you try to run the COM registry fixing tool in NVDA menu / tools?

Yes

log

[XLTechie]

CC: @seanbudd @feerrenrut

[seanbudd]

I think possibly related to #12232, cc: @lukaszgo1

[lukaszgo1]

@XLTechie Could you please test this build just to make sure the issue is fixed for you?

[XLTechie]

Tested and confirmed. Thanks for the quick work.