This FTBFS was caused by version 8.1.0 of python3-pil migrating to testing a couple of weeks ago. There's an upstream bug about this: https://github.com/OpenTTD/nml/pull/182. Their solution of restricting the maximum version of pillow won't work for Debian.
Pillow also has an issue open: https://github.com/python-pillow/Pillow/issues/5203. It would be a shame if openttd got autorm'ed just as the bullseye freeze starts in earnest. Mathias
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