[Yark]

Forward: This is not a severe or game-breaking bug, as far as I can tell.

If you are in a dungeon and walk down - or presumably up - stairs while simultaneously initiating a battle with enemy mobs, the mobs on the next floor will not recognize your presence and will not even patrol.

That wording may be a little clunky so let me clarify:
- Be in a dungeon
- Go down stairs while a new battle is starting
- End the battle and appear on the next floor
- Enemies on this floor do not move or respond to your presence

[Raigen.Convict]

Can they still be fought?

[Miller]

Can they still be fought?

I'm pretty sure, yes. The unresponsiveness isn't necessarily a bug I believe, but the fact you can trigger said unresponsiveness by going down stairs when encountering a mob is.

I'm pretty sure it'll fix itself by exiting the area and reentering.

The unresponsiveness is probably one of Dev's way of reducing lag, since their 'AI' is off until someone actually goes into said instance once.

[Yark]

Yes, you can still fight them and they behave normally once the battle starts.

[Neus]

You should not be able to move down/up stairs when you get engaged anymore.