New 'fish' breeds can not be landfilled

[hackamod]

I am adding various fish species to the waters by copying the default fish enitty, changing the name, and giving it a new autoplace.
Everything seems fine except that landfill will not cover up the new fish types in the water.
Instead the fish blocks the landfill (turning it red on the cursor) or blocking the ghost of a shift-click blueprint.
(default fish are still covered by landfill as usual)

Is there a way to make landfill cover up new fish, or do I need to just leave default fish in the water and randomize the fish loot when mined?

[jodokus31]

I don't know the answer, but I know, that Angels mods also adds new fish, which works to be landfilled
Maybe check those to find a hint
Not sure, which mod it is exactly, I think Angels bioprocessing.

[hackamod]

Thanks, that was just enough of a push in the right direction

protected_from_tile_building

Good day