Boat disappears when player ejects onto an adjacent land block from the river.

Boat disappears when I eject from it, onto an adjacent land block, (dirt or sand).

I've dug around, maybe three horizontally and down, went underwater (thinking it was like boats getting stuck in sand) but it was completely gone, not even in my inventory.

So I closed the game, program opened up my save and my boat had appeared, very obviously where I was digging (shown in photo). I'm sure the other boat that disappeared will be along the river too.

It's happened twice since I updated to the v1.18.0).