Affects Version/s: Minecraft 18w48a, Minecraft 19w09a, 1.15.1, 1.16.3, 1.16.4, 20w51a, 21w15a
Fix Version/s: None
When loading a structure containing waterloggable blocks (which are not waterlogged) next to or inside a water source, the blocks inside the structure become waterlogged.
This is related to
MC-130584, but not the same issue since MC-130584 is about water sources inside the structure spreading; while this report is about external water sources not being replaced and spreading inside the structure.
Note: In some cases this behavior might be desired, e.g. for shipwrecks. Maybe the structure file should support specifying whether a block removes water or becomes waterlogged onces loaded next to / inside water.