Thanks, good feedback. I know where to focus.
What environment do you usually test regarding Linux CEF and wrapper extension and testing?
I tried out wsl2 on Windows 11 (I installed Linux Steam from steampowered.com). I got Steam running and signed in, exported the Steam test app with the latest addon, downloaded zip to wsl2 unzipped on wsl2 (ubuntu 24), and ran the test from the command line (and from Steam using add game). The C3 app loads and runs fine (correct display), but Steam is marked as unavailable.
I followed these directions: construct.net/en/tutorials/exporting-linux-steam-deck-3155
However, it looks like the wrapper extension is not loaded. I connected via remote debugging, but the JS side does not have it on its list. I can launch other Linux Steam Games.
I also see steamworks-x64.ext.so and libsteam_api.so in the x64 dir w/ the app.
I also tried on Ubuntu 22 and got the same result (on a Parallels VM in MaCOS)
I know you at least have it working on Steam Deck, but that's a more complex platform to debug new work. Do you have a recommendation for another environment or something I might have missed?