Only Strays spawn in various frozen biomes

In various frozen biomes, the only hostile mobs that spawn are the skeletons (as expected most of them spawn as strays).

Steps to reproduce:

1. Create and open a new world with seed 297169206, mob spawning disabled, and always day selected.
2. Issue the command /time set midnight.
3. Issue the command /tp 626 86 -285.
4. Issue the command /gamerule domobspawning true.
5. Wait until a bunch of mobs have spawned.
6. Issue the command /kill @e[family=monster]. Note that only strays were present to be killed.

Additional information:

• The pinned comment contains root cause analysis. In short, the biome JSON files are missing the "monster" tag.

Affected biomes:

• Frozen River (frozen_river)
• Legacy Frozen Ocean (legacy_frozen_ocean) - no longer generate in new worlds
• Snowy Mountains (ice_mountains) - no longer generate in new worlds
• Snowy Plains (ice_plains)

This report (including comments) uses a mixture of Bedrock and Java biome names. The following table can be used to translate the Java names to Bedrock biome names.