So now I have the same issue you all have: Plugin is not visible anymore, but still listed in the components dialog ... and all I was changing was the DLL info in the Resources.rc file.
EDIT: ... and when I revert my changes it is visible again! So it is not in the code, this is just depending on this single file and the DLL info/properties.
2nd EDIT: Can please all guys where Voukoder Pro is NOT running in VEGAS Pro 23 please try this update and tell me if it helps?