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For <https://bugs.ruby-lang.org/issues/21716>, the panic is looking like some sort of third party memory corruption, with YJIT taking the fall. At the point of this assert, the assembler has dropped, so there's nothing in YJIT's code other than JITState that could be holding on to these transient `PendingBranchRef`. The strong count being more than a handful or the weak count is non-zero shows that someone in the process (likely some native extension) corrupted the Rc's counts.