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?

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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.