Placed structures don’t generate at the correct y level

Which structure are you trying to place, and where? /place has special conditions which must be met for some structures to properly be placed down. The exact command used would be helpful.

I tried to place several. shipwreck and beached shipwreck, as well as desert temple.

/place structure minecraft:shipwreck 8 200 8 for example appears at ground level. 
However if I try the same command at Y level 64 it still sometimes doesn’t place, this issue appears to be purely based on chance, sometimes works, sometimes doesn’t.
I also tried on a superflat void world and the structures only  appear around -55, if they appear at all (having inputted y levels ranging from -50 to 240).

Also it says the command was successful every time, even if no structure was placed.

These seem to be two different issues. The issue with structures generating on ground level is already tracked in MC-251332.

Edit: Does MC-251434 describe the issue that you sometimes can't place structures like shipwrecks?

Thank you for your report!
We're tracking this issue in MC-251332, so this ticket is being resolved and linked as a duplicate.

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