Not sure if it's intended behavior or not, but I've noticed that enemies that are slowed, either from slow traps, springboards with the slow upgrades or from chilling, get pushed significantly less than if they're not. It's especially notable on battering rams, that go from barely getting pushed at all, to being significantly pushed.

This SEEMS unintended, because it punishes the player for slowing down enemies (and makes the slow tier 4 upgrade on the springboard seem like a downgrade) as opposed to a benefit.

I was noticing my push traps were very inconsistent in when they could or couldn't push battering rams into water, and after removing the chilling dart traps, it improved drastically and they're now perfectly capable of doing so.
So yea, hopefully not intentional!