Furthermore, the new thread introduced to reduce region-wide lag has had some undesirable side-effects.
In the past, when an avatar crossed a region boundary, rubberbanding began. Then, when the avatar was more-or-less rezzed in the destination region, they snapped back to exactly where they were when the rubberbanding began.
Now, the avatar (and possibly a vehicle) continues into the destination sim for some distance, and then rezzes in a position removed from where the handoff began. This can result in penetration of walls (and floors), as well as inadvertant entry into areas protected by security systems, etc, or becoming trapped in an inaccessible part of a build (under a floor surrounded on all sides by a foundation, for example.
Two steps forward, one back