I've been encountering this bug since 1.17 came out. I can't customize my character in character crestor as it doesn't shows changes. I've attached the video with bug proof. I haven't tested in beta yet as I had read the update change logs and haven't found the bug fixes related this topic.
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Yes its was because of resource pack. Solved
Do you have any resource packs enabled? If so, does disabling them fix the issue?