Heart of Gold mission 3 - heroes spawn but do not attack, instead they stack in their dungeons

Hello

I have strange issue in the 3rd mission of Heart of Gold campaign (Gilton). It seems that every time lord Saffire orders an attack, each hero portal spawns heroes. But these heroes don't attack unless I've already breached their dungeon. If I didn't, they wander around their dungeon and it seems they train so they eventually hit 10th level. At some point there's so many of them that when I finally breach their dungeon, I get overwhelmed by them and lose mission. I know that destroying all outposts and killing Saffire is optional and I can beat that level without this, but these stacking heroes' groups make some achievements on this level impossible to unlock. It doesn't seem to be save game related because I've restarted mission several times.

And I think this save shows another bug - enemies near my Bombards after loading a game turned neutral and lost their HP marker. It seems to happen randomly, happened to me in different missions, usually I had rally flag active while saving a game.

And one more thing, I think AI of enemy diggers went nuts - they're digging my dungeon's walls for reason that is mystery for me.
My PC
Windows 7 64bit
AMD Ryzen 3 1200 @3,1GHz
8GB RAM DDR4-2400 (single channel)
Nvidia GeForce GTX 1050 Ti 4GB GDDR5 (MSI GeForce GTX 1050 Ti 4GT OC 4GB GDDR5)
motherboard ASRock AB350 Pro4

output_log.txt

dlc1_campaign_level3_name_20171122213310.meta

dlc1_campaign_level3_name_20171122213310

I've also encountered a bug that makes some artifacts respawn after loading a save game in 2nd mission of HoG, but it's not really game breaking bug and I'll post it in separate thread later.