Bandit 1.6.3 does not respect excluded paths from .bandit file

With a .bandit file with the contents

[bandit]
exclude: ./.tox,./tests

1.6.2 gives

$ bandit -r -ll -ii .
[main]	INFO	Found project level .bandit file: ./.bandit
[main]	INFO	Using ini file for excluded paths
[main]	INFO	Using command line arg for selected targets
[main]	INFO	profile include tests: None
[main]	INFO	profile exclude tests: None
[main]	INFO	cli include tests: None
[main]	INFO	cli exclude tests: None
[main]	INFO	running on Python 3.7.5
114 [0.. 50.. 100.. ]

1.6.3 ignores the exluded paths

$ bandit -r -ll -ii .
[main]	INFO	Found project level .bandit file: ./.bandit
[main]	INFO	Using command line arg for excluded paths
[main]	INFO	Using command line arg for selected targets
[main]	INFO	Using command line arg for recursive scan
[main]	INFO	Using command line arg for aggregate output type
[main]	INFO	Using command line arg for max code lines output for issue
[main]	INFO	Using command line arg for severity level
[main]	INFO	Using command line arg for confidence level
[main]	INFO	Using command line arg for output format
[main]	INFO	Using command line arg for output file
[main]	INFO	profile include tests: None
[main]	INFO	profile exclude tests: None
[main]	INFO	cli include tests: None
[main]	INFO	cli exclude tests: None
[main]	INFO	running on Python 3.7.5
549 [0.. 50.. 100.. 150.. 200.. 250.. 300.. 350.. 400.. 450.. 500.. ]

Reproduce the issue with a project-level .bandit file containing the shown exclude paths and the bandit -r -ll -ii . command, comparing versions 1.6.2 and 1.6.3. Trace how the .bandit configuration is read and confirm that the excluded paths are omitted from the scan in the affected version.