When generating a new world or loading an old world on a BDS all Unloaded chunks have stone replacing a blocks. All structures are present , structures like shipwrecks are brought to the surface on top of stone.
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Thank you for your report!
We're actually already tracking this issue at BDS-6230, so I will resolve and link this ticket as a duplicate.
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i have same problem. i have had to create a local world and spend hours flying round to generate large chunk area and then upload it. all you already discovered chunk will be normal. however if you go to chunk which is not yet generated it will generate all stone. its not ideal but it works as a temp solution until Mojang fix the problems