The bug
Corals are intended to schedule a random amount of ticks to die in. This works correctly for coral blocks. However, fans/plants wrongly use random block ticks instead. This means when random tick speed is zero, only coral blocks will die.
How to reproduce
/gamerule randomTickSpeed 0Place a coral block and a coral plant (away from each other because of MCPE-57197)
Watch as only the block dies
Attachments
Comments 3
With a random tick speed of 0, coral blocks die on world reload. Random tick speed was still 0 after the reload and other blocks which have random ticking weren't affected.
1.18.3
Correction: Coral blocks don't abide by the random tick speed gamerule at all. Most likely due to a reload with random tick speed of 0 as changing it doesn't fix the issue.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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I can reproduce for coral plants, but coral fans always instantly die even with random tick speed set to 0.