Conservative reference type in memory graph?

I was investigating a memory leak issue using the memory graph and I came across this reference type "Conservative"

I've seen before "unknown" where the graph is unable to determine if this is a strong or week reference. but this keyword is somewhat new to me.

Is this somewhat related to conservative pointer detection mechanisms?

Yes, what were unknown references in Xcode 11 are now conservative in Xcode 12, so it would be great to know the difference.

This is an Xcode tooling question; nothing happened at the language-implementation level that I know of.

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