Yes I do, I have English (US) and Brazillian Portuguese. The former is setup as my main layout and the latter as my secondary and I switch between them using a keybind.
I tried testing your theory, and it seems to be correct. It is dependant on the keyboard layout that is selected before I start the game. Starting with EN works normally and with PT-BR causes the bug to occur. The fact that my PC always defaults to EN upon start up explains why it was always fixed whenever I rebooted my computer...
I hope it will get fixed on some future update, but until then I'll just be glad that I found a consistent way to make it work without rebooting my PC every time I want to play the game. I'll probably post this on the Steam Community Forums and Proton DB to help as many people as I can deal with this bug.
Thanks for your time and helpful information!