This is a duplicate issue, head to MC-131708. for the original issue.
Tall Seagrass at most places in a world due to how their positioning is done, will glitch into other blocks textures due to being too far to one side with some places being worse than others
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Jarl-Penguin
Z-fighting is covered in MC-131708.
migrated
Likely won't get fixed, see MC-19005