My bot works fine but when I run it in the PiP mode I received the same error.
I first opened Chrome in the PiP mode and enabled the UiPath extension. Not sure if this helped because I still got the error.
I went to the “Use Browser” activity (“Open Browser” if you use classic) and went to the “options-browser” (“options”) in the properties window and there is a “User data folder mode” I changed the drop down to “DefaultFolder” and then my bot worked in PiP mode.
I hope this helps!
Here is a link where UiPath has some additional information.
“User Data Folder Mode”