Not a game-breaking bug, however I have a little collection of frogs in my Minecraft base and made sure I had at least one of each type. My only temperate frog was named Slippy, and now she is a warm frog. My cold biome frogs are unchanged, and my base is in a savannah biome. Found at the start of 1.20, unsure if it's still an issue but I will update if I end up hunting for another temperate frog.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Could you please attach to your bug report the world on which the issue can be observed if this still reproduces for you?