Kelp farm broken (zero tick)

Zero-ticking itself is technically a bug, so they removed that as a feature. You'll have to make a different kelp farm, silentwisperer has a good design if you need one

Does this only happen on a realm or does the same issue occur in a local world?

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it's also happening in a local world

This was clearly a bug. In an earlier version, such bamboo and sugar cane farms were already fixed. MCPE-127388

Zero tick kelp growing stopped working in Windows 10 PC Bedrock v1.17.40.20 - 23 Betas and v.1.18.0.20 Beta single player worlds with Experimental enabled. Kelp growing is now like sugarcane, very slow. Previously working kelp farms no longer work. 

Thank you for your report!
We're tracking this issue in MCPE-127388, so this ticket is being resolved and linked as a duplicate.

That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.

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