jupyter-cache has failed
tests/test_cache.py::test_execution[temp-parallel] or [local-parallel]
in unstable/arm64 4 out of the 7 times with logs available (excluding
python3.14 runs, which always fail with a different error).  It has not
so failed in testing/arm64 (which has the same version of jupyter-cache)
or unstable/any other architecture.

https://ci.debian.net/packages/j/jupyter-cache/unstable/arm64/

This is not *obviously* known to upstream.