false negative SyntaxError failures on f-strings

[atloo1]

in a post_gen_project.py hook I do

import subprocess

LICENSE_IDENTIFIER_TO_FILENAME = {
    'Apache-2.0': 'apache_2.txt',
    'BSD-3-Clause': 'bsd_3_clause.txt',
    'MIT': 'mit.txt',
    'OSL-3.0': 'osl_3.txt',
    'Proprietary': 'proprietary.txt',
}
MV_CHOSEN_LICENSE_COMMAND = [
    'mv',
    f"licenses/{LICENSE_IDENTIFIER_TO_FILENAME['{{cookiecutter.project_license}}']}",
    './LICENSE',
]
RM_OTHER_LICENSES_COMMAND = [
    'rm',
    '-rf',
    'licenses/',
]

def main():
    """use selected license"""
    subprocess.run(MV_CHOSEN_LICENSE_COMMAND)
    subprocess.run(RM_OTHER_LICENSES_COMMAND)

if __name__ == '__main__':
    main()
    sys.exit(0)

My preferred, still valid, f-string syntax w/o double quotes f'licenses/{LICENSE_IDENTIFIER_TO_FILENAME['{{cookiecutter.project_license}}']}' breaks tests:

    def test_cookiecutter(cookies):
        result = cookies.bake()
>       assert result.exit_code == 0
E       AssertionError: assert -1 == 0
E        +  where -1 = <Result FailedHookException('Hook script failed (exit status: 1)')>.exit_code

tests/test.py:16: AssertionError
--------------------------------------------------------------- Captured stdout call ---------------------------------------------------------------
<Result FailedHookException('Hook script failed (exit status: 1)')>
--------------------------------------------------------------- Captured stderr call ---------------------------------------------------------------
  File "/tmp/tmpk56yxsr6.py", line 55
    f'licenses/{LICENSE_IDENTIFIER_TO_FILENAME['Apache-2.0']}',
                                                ^
SyntaxError: f-string: unmatched '['
---------------------------------------------------------------- Captured log call -----------------------------------------------------------------
ERROR    cookiecutter.hooks:hooks.py:164 Stopping generation because post_gen_project hook script didn't exit successfully