The bug
I found a Swamp Hills with a beach bordering around it. The seed is -4165536068241575960 and the coordinates are 1491 64 687.
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Can confirm in 20w49a. To make this issue easier to reproduce, here's a useful command.
/execute in minecraft:overworld run tp @s 1572 93 717 facing 1601 51 736
can reproduce in 1.13-pre5