On Minecraft bedrock be it Windows 10, IOS, Android any cave that is generated with the mouth intersecting the ground at y=63 will be waterlogged. We believe it is being treated as an opening like a river or an ocean and therefore will be waterlogged. This is for all caves that open to the surface. If a cave does not open to the surface it will not be treated as an ocean and therefore not be waterlogged
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Thank you for your report!
We're tracking this issue in MCPE-125379, so this ticket is being resolved and linked as a duplicate.
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Most of my caves are underwater and/or flooded as well.