In a standard application, we see class loading level out around ~10-20k classes, however after applying the blackbird module we've seen our loaded classes metric grow until it reaches ~2 million and the JVM is restarted due to an OME. This is running on java 15, although I don't know if it's exclusive to java 15, or which codepath is creating the classes, or why they're not unloaded yet. I'm still working through debugging the problem.

What I know so far:
Encountered only when blackbird is in use.
Metaspace is filled over time.
Loaded classes as reported by the JVM approaches 2 million (where I'd expect tens of thousands)
Impacts java 15. Maybe others, but I don't have a reproducer to validate whether or not only java 15 is impacted.