From the patch notes, added emphasis mine:
In other words, they did some tweaking of the map itself, tweaking they needed for the anti-undermesh measures that they’re working on and testing on TestLive. They haven’t activated those measures on live servers, for Siptah. The explanation for why not is in the post I linked previously.
Don’t shoot the messenger, by the way. I promise I had nothing to do with any of those decisions 