When kelp is broken off by a piston and the base kelp is left to continue to grow, the age of the kelp no longer increases by 1 with each growth. The age displayed in the debug screen seems to be random with each growth after being broken by a piston. To recreate this, place a piece of kelp down and notice how the age goes up by 1 with each growth. Then use a piston to break the kelp off, but leaving the bottom kelp to regrow. Take note of the new age of the kelp, and how it no longer increases by 1 with each new growth. It seems to be randomly generating a new age.
MC-142474
Piston causing kelp aging problem
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Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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