Zombies, spiders, creepers and skeletons spawn in river biomes in java, but in Bedrock Edition they don't spawn in water depths, they have not spawn weights, this is an old issue, please fix it
Note that these mobs spawn in shallow water, but not deep water, which requires Java parity.
Mojang can add "monster": {}, tags in the biome files for river biome to solve the problem
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We're tracking this issue in MCPE-161245, so this ticket is being resolved and linked as a duplicate.
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