It looks like the enemies have simply stopped attacking - as if they've given up. I even try to pepper them with some artillery, but they just stand there with their big army, doing nothing.

Sometimes using the kill all units console command sort of "resets" them, and some attacks then resume, only to stall after some time. The mod is 0.18.17, Factorio is 1.0

I encountered this while starting random games to get the mod to work at all. I found that toggling the invulnerability variable brought them back to swinging - you might try that

/c game.player.character.destructible = false

I would need to see a save otherwise this description is not enough.

https://ibb.co/54W3gbh

He is telling the truth I am standing right in the middle of the nest even if I shoot it, or anything they just ignore me.

O.K. I google around, and found out sometime the enemy just give up for awhile then attack again, and I test, and went afk for awhile, and I see some items are being attack, but doesn't wipe you out for some reason.

It don't even attack you, and when it does it attack maybe 1 or 2 times, and that's it.

IMO, I think this take away the challenge, and make the game not fun, but I can understand why it's to give players time to build so it doesn't pressure players too much I guess.

I'm pretty sure this was a vanilla bug that was fixed in 1.1 of factorio