When trying to defeat the ender dragon in 26.1 Snapshot 1, it is unable to take melee damage when perched on the bedrock. It does still take ranged damage when flying around. This issue was fixed when I went back to 1.21.11.
MC-305300
Ender dragon does not take melee damage when landed
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I wasn't able to recreate this behavior in 26.1 Snapshot 1. I could still deal melee damage to the ender dragon while it was perched on top of the bedrock. Could you please provide more details regarding the problem you're facing? Videos and/or screenshots would be greatly appreciated.