Heavy plasma hides the corpse.

[Docent]

Hello.
How does the game determine which bigob to show and which to hide if they are on the same tile? I play FMP + my own submod. Previously, this did not seem to be, but now a heavy plasma hides the corpse. But the plasma rifle does not hide the corpse.
What is broken and where to fix it?

[Meridian]

heaviest item is shown

[Docent]

Ah, here's the thing. Thank.