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Those are the changes with the current behavior from the behavior in 3.5 observed at the time of the initial bug report:
 python 3.7:
 return.py Unchanged.
 exception.py After a jump from the 'exception' event into the previous statement, the ensuing 'step' command triggers a trace 'return' event.
 jump.py The sequence of trace events is unchanged and Python aborts now at the last 'step' command with:
 python: Python/ceval.c:1083: _PyEval_EvalFrameDefault: Assertion `STACK_LEVEL() <= co->co_stacksize' failed.
 python 3.8:
 return.py Unchanged.
 exception.py Unchanged from 3.7.
 jump.py The sequence of trace events is unchanged and the last 'step' command prints now the cryptic error msg:
 TypeError: 'NoneType' object is not callable
 > /path/to/jump.py(2)gen()->0
 -> for i in range(1):
Applying the last patch fixes both 3.7 and 3.8. I can build a PR from this patch. An explanation should be given for the behavior of 3.7 and 3.8 in the jump.py case.