Meaning you can't see/attack the bandits that spawn? (That has never happened to me, yet, at least.)You can only log off now, no changing channels. And there is a penalty either way. It might be better to be ambushed than log off because ambushed goods are partially returned to you in ducat form via mail due to the wanted board.
Sorry for not clarifying.
The hiding bandits will not display properly, as in not rendering. They are still there, they can still be triggered, but they are not detected by heartbeat and you won't know you're near one till you step in the region that triggers a spawn.
After triggering the spawn, the fight commences normally, meaning none of the bandits you fight are invisible. You fight them, they try to steal your goods, etc.
So the only affected issue is the hiding bandits, and it's purely a visual problem for whoever triggers the spawn.