gh-95795: Move types.next_version_tag to PyInterpreterState by ericsnowcurrently · Pull Request #102343 · python/cpython
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One minor note from a first readthrough. Honestly, I have no idea why this PR would cause an assertion failure in insertdict during an attribute load. Everything about that seems wrong.
Maybe try rerunning locally, but setting ENABLE_SPECIALIZATION = False in opcode.py and regenerating everything. That way we can try to figure out if specialization is indeed the culprit, or if this is maybe some freeze/deepfreeze weirdness.