This jar is reporting that its 21w19a. Downloaded from here:
https://www.minecraft.net/en-us/article/minecraft-snapshot-21w20a
link at bottom of the page points to https://launcher.mojang.com/v1/objects/d0a9151432af384f5f2ca72e8e43422772158d0e/server.jar
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We're tracking this issue in WEB-4508, so this ticket is being resolved and linked as a duplicate.
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