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Thunderbird Calendar: Annually repeating date does not show up on mondays

Making moves

Hi community,

some years ago a added some holidays with fixed date, like New Year, to my Thunderbird Ligthning calendar (version 102.6.1 (64-Bit)) as starting and ending at 1.1., repeat frequency 1 year, and no limit.

This seemed to work fine all the years since, but now I noticed, that at 1.1.2024 no entry shows up. Further checks gave the same effect at 1.1.2018 and 1.1.2029, all of them having a Monday as day of the week.

Has anyone an idea what may cause this strange behaviour?

All the best, and a Happy New Year