Automatic dark / light theme switching thunderbird 91.2.1 not working

Hi, since Thunderbird 91 the system theme is not switching properly from dark theme to light theme. It hangs half way, the toolbar turns to the light theme with white font (so not readable) and the rest stays dark theme…

I have to switch the system theme on and off in Thunderbird to get it working again. Its a small thing but annoying…

Thanks

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Problem seems to be NOT solved after latest testing-update-2021-10-27

same problem for me. waiting for news…