It's easy to fix it yourself.
Find all leaders in units folder
and add those lines to them
CmdCost = 0
Pillage = 0
These are two missing lines in some leader files. Pillage is not the case, but all others have them, so why not add it too?
It looks like until number 2215 [ROMPompedius Silo.uni] all have it, so problem starts with higher numbers. Good luck.
Meteoryt-like user. Strikes and disappears.