This is my setup for BBC that has worked consistently.
I have wine 10 normal version and also used wine 9 staging with it. yabridge 5.1.1 in ubuntu 24. I do not use carla. I recently had an update that broke a few plugins with wine 9.x staging but I changed over to wine 10 normal. I use these settings checked under winecfg and with BBC:
emulate desktop
allow window manager to decorate
allow window manager to control
Also I am not sure which version of BBC you are running but I have an older version. LABS on the other hand has been a real pain to get up and running especially offline.
I think everything is fine with your setup. For a couple of plugins of mine, re scanning faulty from the plugin manager has worked where other things didn’t. Also, it could be useful to verify that on the /.vst3/yabridge/BBC (…) location there is a “content” directory with both the win vst link and the linux .so.