Thanks to a completely unnecessary request by to have guardrails attached to this bridge, now the modified bridge has no region crossing buffer coverage on the left side from Amida at https://maps.secondlife.com/secondlife/Amida/2/71/28

As you can see in the screenshot with the Gualala part of the bridge derendered, the crossing buffer is not long enough on this side, so if we walk on the left side or veer to the left side with a bicycle due to lag, we fall into the water through this physics gap on the region crossing.

If you make the buffer about 5 meters longer here, it should resolve this problem.