I have also been able to reproduce the issue, happens with only 1 client connected as well.
From the linked issue tracker entry, set the dormancy to DORM_Never to fix the issue:
In WorldDataLayers.cpp:62, replace
SetNetDormancy(DORM_Initial);
with
SetNetDormancy(DORM_Never);
I have not tested the fix, will test tomorrow.
EDIT: The fix works