Breachstone without enemies

Hi

I just opened a breachstone and when I stepped into the purple startpoint I first had 10-15 enemies spawn.
Then a lagspike happened (those have been regular for a while now) and the screen froze, and after a while it caught back up and started as normal, but no enemies were spawning anymore.

I still had 30-35 seconds left on the breachstone and for those 30-35 seconds no enemies spawn at all so it ended up timing out and I failed the breachstone.

Has this happened to anyone else?