Summary:

Java Snapshot 22w16a (https://www.minecraft.net/es-es/article/minecraft-snapshot-22w16a) made a change that allows frogs to spawn on mangrove roots and moss carpets, which on bedrock they currently do not do. 

Steps of reproduction:

1. Go to a Mangrove swamp
2. Make a platform of Mangrove Roots high in the sky preferably 128 blocks away from the surface.
3. Go at least 24 blocks away from the platform. 
4. Observe if frogs spawn or not. 
5. Repeat with Moss Carpets.

Expected results

Frogs start spawning on the roots and carpets.

Observed Results

No frogs spawn on the roots or carpets.