I can't replicate it on my Mac. Same OS and version of LR.
First, try disabling GPU in the preferences (Performance). Any better? If not, recalibrate and build a new ICC display profile; the old one might be corrupted. If you are using software/hardware for this task, be sure the software is set to build a matrix, not LUT profile, Version 2, not Version 4 profile. Also see: https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html