-When respawning the Ender Dragon using 4 ender crystals, the obsidian towers get destroyed, sometimes completely.
-The ender crystal particles effect when respawning the Ender Dragon aren't aiming for the towers, like the game doesn't know where the obsidian towers are.
-Ender crystals aren't being replaced.
Thank you for your report!
However, this issue is a Duplicate of MC-138225.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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