I gotta run for the day. The shortest way for me to reproduce is to focus on the tests that were added in 3.10 and shortening the repetitions a little:

$ time ./python.exe -E -Wd -m test test_exceptions -R3:3 -m 'test_attribute*' -m 'test_getattr*' -m 'test_lineno*' -m 'test_name_error*' -m 'test_recursion*' -m 'test_no_hang*'

0:00:00 load avg: 5.92 Run tests sequentially
0:00:00 load avg: 5.92 [1/1] test_exceptions
beginning 6 repetitions
123456
......
test_exceptions leaked [2, 2, 2] references, sum=6
test_exceptions leaked [2, 2, 2] memory blocks, sum=6
test_exceptions failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
    test_exceptions

1 re-run test:
    test_exceptions

Total duration: 11.8 sec
Tests result: FAILURE
       12.13 real        11.44 user         0.61 sys