I've made a lot of progress with this bug in the last few days.
The issue is the text to speech feature that was added in fhm9. It uses a 64bit dll which wine/proton doesn't like.
I've managed to get it working perfectly on my PC (Ubuntu). On the steam deck it now loads the 2d game and simulates properly, but on the deck doesn't load the ice arena image or the players so is mostly just a grey screen.
Could you try it and let me know if you get a similar result.
It would be really helpful if the fhm10 team could look at why the 32bit dll works and the 64bit doesn't as an update from them may get it working straight away in the future without us having to fiddle...
Full details are here:
https://github.com/ValveSoftware/Proton/issues/7552
This is the fix:
I downloaded the 32bit version qTextToSpeech-sapi.dll from:
https://www.pconlife.com/viewfileinf...eech-sapi-dll/
and put it in the folder:
steamlibrary\steamapps\common\Franchise Hockey Manager 10\texttospeech\