Grass and seagrass generation broken in bedrock 1.21.93

Version:

Minecraft Bedrock Edition v1.21.93

(Platform: Mobile/Android, but likely affects all Bedrock platforms)

Summary:

After updating to Bedrock v1.21.93, grass plants (short/tall) now frequently generate on sand blocks, and seagrass has been observed generating in non-ocean biomes, including swamps — over 500 blocks away from the nearest ocean biome.

The grass in Sand was rare in previous versions, but is now consistently and commonly reproducible.

The seagrass is 1 case I found.

Steps to Reproduce:

For sea grass:

1. Create a world with seed 3284072231067446220.

2. Teleport to coordinates 3486, 70, -1083.

3. Observe seagrass growing in a swamp biome with no ocean biome within ~500 blocks.

For sand: Explore newly generated terrain and observe that grass and tall grass commonly appear on top of sand blocks, especially in desert or beach border areas.

Expected Behavior:

Grass and tall grass should only generate on dirt-like blocks (grass_block, dirt, podzol, etc.).

Seagrass should only generate within valid ocean biome blocks.

Water should not be blocked by plants like seagrass in open flow areas.

Actual Behavior:

Tall and short Grass appears commonly on sand blocks.

Seagrass generates in swamps with no nearby ocean biome.

Seagrass prevents water flow like a solid block.

This behavior began with v1.21.93 and was not present or very rare in earlier versions (e.g., v1.21.92).

Suspected Cause:

Decorators (like grass and seagrass) are now being placed before the final terrain surface pass, allowing sand to overwrite the block beneath without removing the plant.

This suggests a mis-ordering of feature placement passes, likely introduced during the chunk loading and generation tweaks in v1.21.93.

Notes:

This is not a biome blending issue. Verified biome is Swamp using external tools. Reproduced in multiple new worlds on v1.21.93. The issue appears widespread and consistent.