Basically, if you load a structure via /structure or structure block, any blocks that can be waterlogged will automatically be waterlogged, even though the original structure had a un-waterlogged version of the block.

This here is a picture of an example structure that was summoned underwater, where it's observed that the glass panes and the chest are waterlogged

How to Reproduce

1. Download the behavior pack with the attachment
2. Do the command "/structure load mystructure:test_structure ~ ~ ~" in a large body of water.