Often, entry into the python console causes modifier keys to stick

[XLTechie]

Steps to reproduce:

Actual behavior:

I can't give an exact STR without describing the actual behavior, and because this problem is intermittent.

For the last many alphas (probably all since 2020.4, maybe before), entry into the python console causes the NVDA and control keys to stick, perhaps over 60% of the time. I then have to restart NVDA to clear the jam (there may be other ways, I don't recall).

For example: pressing NVDA+ctrl+z, waiting for the prompt to appear, and then starting to type "import", will cause first the mouse settings dialog to open, then the configuration profiles dialog.
Possibly after that, more typing will start interacting with the dialog, or the keys will continue to stick, which eventually leads to a config reversion once the "r" is reached.

problem with python console log fragment.txt

Expected behavior:

Core doesn't freeze, the modifier keys release, the python console allows normal typing.

System configuration

NVDA installed/portable/running from source:

Installed

NVDA version:

alpha-22516,a0089a2f

Windows version:

Currently 20H2 (OS Build 19042.928),
but this has gone back at least through V2004.

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

It might be relevant that this usually happens while Firefox is running, and possibly only while I'm focused on Firefox. However, I am not sure about that.
FF 84 through FF 88.

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.

Many, see above. I don't think this goes back before the post 2020.3 alpha sequence.

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

Yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes

[XLTechie]

cc @josephsl @michaelDCurran

[CyrilleB79]

I have sometimes encountered modifier keys remaining in down state for a long time (also before 2020.4) but not so often and not necessarily in the console.

In this case, I press all the modifiers one by one (both control, shift, alt and 3 NVDA) and things turn back normal.

Of course, it is not a solution.

[cary-rowen]

Yes, I have encountered this situation, but it is not easy to reproduce.

[JulienCochuyt]

I'm a huge NVDA Python Console user, can't remember a working day in the last 5 years or so without using it.
Faulty sticky modifiers key is something most intensive keyboard typist encounter more or less frequently, but I never could associate it with the opening of the NVDA Python Console.
I'm not stating the present report is wrong in its assumptions, but rather that there might potentially be outside factors influencing the odds of its occurrence in this very context.
FWIIW, as it seem the type of keyboard in use might influence the overall odds of faulty sticky modifiers keys, I'm most of the time typing on a TypeMatrix 2030.