Spring feature spawns below gravel, despite gravel being invalid block for spawning.
Repro steps:
Create Creative world with seed 9170029319229605673
/execute in minecraft:overworld run tp @s -3194.08 111.93 -1718.59 538.20 -2.55
Observe the bug.
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We're tracking this issue in MC-750, so this ticket is being resolved and linked as a duplicate.
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