@miwob I have confirmed this issue for 1.16 Pre-release 6 in three different situations:
Single Biome world with the biome set to Mushroom Island Fields.
Single Biome world with the biome set to Mushroom Island Field Shore.
Default world with seed 3702715441799600534 at coordinates 253 74 1029. This is the center of a large mushroom island with render distance reduced to 2 to prevent spawning in any chunks that may include an ocean or ocean variant biome.
The phantom spawning in any of these three situations cannot be caused by MC-93271. And if I understand current phantom spawning mechanics correctly, they spawn in the air above the player, so the existence of solid blocks in the surrounding ocean biome shouldn't affect phantom spawning.
Pandeoo
MC-126778
Normal
@miwob I have confirmed this issue for 1.16 Pre-release 6 in three different situations:
The phantom spawning in any of these three situations cannot be caused by MC-93271. And if I understand current phantom spawning mechanics correctly, they spawn in the air above the player, so the existence of solid blocks in the surrounding ocean biome shouldn't affect phantom spawning.