Disappearing fragments Destructibles and alternative for World Support..
So, on your first point, Unreal currently has a limit on how many Destructive Mesh chunks it will support at once (somewere around 10,000 parts). You can change this inside the Apex files, but I wouldn't recommend it if you plan on releasing your game publicly- even the faster gaming computers will struggle with it.
Second point, if your hitting that chunk limit, DMs just start to fail over; lossing things like support which need to be calculated every physics tick.
I would suggest pulling back on an entirly destructible enviroment to reduce your DM chunks and build some 'ruinned' buildings as static meshes, and putting DMs on them to have them look 'not ruinned'. That way, when a DM (say a wall) is destroyed, it will look like a destroy building that is still standing.
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