As of version 1.21.40, the old biomes_client.json is no longer loaded from the vanilla resources, in favor of the newer "client biome" files; however, the "water_surface_transparency" field that warm oceans used was not ported over, causing warm ocean water to render at the default transparency.
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Confirmed in 1.21.44

This issue has been resolved in 1.21.60.24 with the addition of the surface_opacity field in client_biome files. The warm ocean file was changed to have its original 0.55 opacity.
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However, this issue has been temporarily resolved as Awaiting Response
Is this still an issue in the latest version?
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It's been fixed in the 1.21.60 Previews, like the Fix Version/s field suggests. The report will remain open until 1.21.60 releases.