Summary:
Sea pickles cannot replace grass, tall grass, ferns, large ferns, snow layers, light blocks and nether sprouts.
Steps to Reproduce:
Place any of the blocks listed above
Aim at the block
Attempt to replace the block with a sea pickle
Observed Results:
The sea pickle cannot be placed.
Expected Results:
The sea pickle should be placed.
Video:
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Can confirm in 1.16.210 on xbox one. They can replace sea grass however. Relates to MCPE-33346