Unstable formatting: Comment is moved to lower line twice

[Zac-HD]

With current latest black, 23.3.0 (compiled: yes):

import black

code = """
assert some_long_name, (  # long __________________________ comment
        'long ___________________________________ string %s' % str(variable))
"""
black.format_file_contents(code, fast=False, mode=black.FileMode())

Specifically, this stabilizes at the second run:

assert some_long_name, (  # long __________________________ comment
        'long ___________________________________ string %s' % str(variable))

assert some_long_name, (
    "long ___________________________________ string %s"
    % str(variable)  # long __________________________ comment
)

assert some_long_name, "long ___________________________________ string %s" % str(
    variable
)  # long __________________________ comment

[JelleZijlstra]

3706 and #4384 reported additional cases of what looks like the same bug.