UE4.23 stuck Build

My CPU ( i7-9700K 3.6) gets to 100% usage and the progress bar does not improve in HOURS after I upgraded UE4.22 to 4.23, There’s nothing I can do but force shutting off process UnrealLightmass. It worked fine a couple weeks ago when i was using previous unreal version. I’m using W10. Anyone else having same issue?