The gamerule "snowAccumulationHeight" is not included in Bedrock Edition. This was added to Java Edition in 1.19.3.

https://www.minecraft.net/article/minecraft-java-edition-1-19-3

Added snowAccumulationHeight game rule

• When it is snowing, this game rule determines the maximum number of layers can be accumulated in each block
• Defaults to 1
• Set to 0 makes no snow form at all
• Set to 8 or above lets snow form up to the level of a full block

Steps to reproduce:

1. Enter a world with cheats on
2. Go to chat
3. Type:

   /gamerule snowAccumulationHeight

Observed results:
There is no /gamerule snowAccumulationHeight in Bedrock.

Expected results:
It should be there in Bedrock as Java has it in Java Edition 1.19.3.