Understood - would you be willing to join a Discord working group I'm setting up to look at this problem? If so, please send your handle to asemail00@proton.me and I will reach out.
Hello. I ended up making a debug build of the game. It has a visualiser on the main menu that tells you what is sending the input. If you could send a screenshot of it I may be able start investigating where to look.
https://drive.google.com/file/d/1LTbVn9qcQ-77nz0g76Y1H0V9hu54O2iC/view?usp=shari...