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I'm happy that CantFreezeTrait was added, but I noticed that it lacked CantFreezeTrait on the recent update on Walkers mod on Minecraft 1.21.1.

Alright, I just backported it as of 57bf77e. Please note that I do not officially support versions older then 1.21.2 anymore, so it might take some time until I publish the backport. However, you can download the backport in the GitHub Actions - Artifacts section.