I have found the same issue with my LG 34WK94U. whih is the widescereen 34 in. I have a 27 in 5K also and it works properly on that monitor. This just started with beta 2 and i have been playing with iot for a few days now. A reinstall with the current released OS it works fine. But upgrade to beta 2 and the monior acts up. It does seems to be just this monitor as I can connect other monitors here and it works fine.I have also changed to a hdmi connection and it works fine. Issue is just with thunderbolt on this monitor.
mpf541
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i just upgraded to 19E250c. My monitor is now working properly again.