Your comments

Does it happen when the tweaker is not running? Does it happen when all options are off? If not, which option causes it?

Also note that Excel has several cases of special behavior regarding the taskbar. See this topic in which I link to several such cases, perhaps one of them is similar to yours.

Thanks for the report. Should be fixed in the newly released beta version, 5.8.0.4.

Please try the new beta version, 5.8.0.4.

Please provide a screenshot to clarify what you're referring to.

That's not related to the taskbar, so unlikely to ever be added to 7+ Taskbar Tweaker. Unless I misunderstood the suggestion?

It's not that it's totally unrelated. In any case, I'll keep your suggestion in mind. I can't comment on other apps, haven't tried any, and I also haven't used AnyDesk.