Couldn't find anything elsewhere on that. Everything went fine at every level until Pleasentville. I did have to reload a saved game 1-2 times during He Hungers but all the enemies afterward behaved fine...until elektro-doggy infected his first zombie. The zombie just stayed there, all electric effects rolling and no amount of ammo could kill it.

I took a break from him and went up the other ladder, I was greated by 2 headcrabs behaving perfectly well. After finding the battery (nice placement!) I went back to see the electrified zombie and it hadn't moved a bit. Emptied a few mags into the doggy wrapped around his arm but couldn't kill it. Since I can't get the dog's battery, I'm stuck in that area.

Not sure if it is related to the AI bug. I did subscribe to the mod that is supposed to fix it but it didn't change anything so I'm not sure it is related.

I'm in no way complaining, HL:A is the gift that keeps on giving thanks to people like @fmpone creating such wonderful content... I'm just sharing the experience.