I got strange bug which is mod breaking. Robots can have 0 hp! With this they not get attack by Worms, and have immunity to bitters damage, and destroy everything.
My config: https://pastebin.com/Y8EftiGn
Screenshot: https://i.imgur.com/KaocnKJ.jpg

I tweak only healing rate to 0

You changed the healing rate in the unit prototype lua? This is a very strange bug!

Yes i changed only healing rate in lua prototype.

After i think setting hp scale 0.5 fixed this bug, i find after while this is still exit: https://i.imgur.com/so7r64t.jpg
Invicible terminator is a bit OP ;(

My mods: https://i.imgur.com/6w2b5KE.png
My save for testing: https://drive.google.com/open?id=1LMnbn3Q8v9Q-_IKfnUY4DNuiVWctjXLy
My actual config: https://pastebin.com/yXR9b1F2

Load save even without my mods, only set hp scale like in my config.
I walled this op 0hp terminators, soo you dont need spent time to reproduce this bug :), tell me if you need any more info. Let this fancy info help you to fix this :)

Because actually this is how it actually look like: https://i.imgur.com/xJwhg69.jpg
Just OP unkillable thing.