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I can replicate this on the frozen Linux binaries. Removing and regenerating the file calibre-4.99.4-x86_64/lib/python3.8/site-packages/calibre/gui2/preferences/look_feel_ui.pyc based on the py3 branch was sufficient to get it to work.
The problem doesn't manifest if, like me, you build your own or use the CALIBRE_DEVELOP_FROM environment variable pointed at a copy of the source. In that case, calibre/gui2/preferences/look_feel.ui will be regenerated with pyuic and the problem will go away.
Looks like something went wrong in the build environment. The source code is fine though.
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