Same here, Windows 10, from both 4.4.3 (& 4.4.4 Early Access), VCV Rack 2 (v2.2.0) CLAP plugin isn’t in list (perhaps it’s discarded by Bitwig, in case of plugin failure).
From REAPER 6.71, the CLAP crashes with an error message, then will be discarded. I’ve sent a screen capture in another topic (here, bottom).