The Ventura 13.4 update introduced a display signal lost bug which when the monitor is put to sleep after power saving setting is reached or if manually using the shortcut keys to put sleep the display, it wakes up the monitor briefly then tries to go back to sleep for 15 seconds and then wakes up with the “no signal” warning in an infinite loop. It's starting to be reported by others, where this did not exist until after the update.
Reddit: Ventura 13.4 Display Sleep Issue https://www.reddit.com/r/MacOS/comments/13lyu2y/macos_ventura_134_display_sleep_issue/
I tried everything from turning off power saving settings, turned off screen saver, WoL, uninstalled color calibration software, reset monitor to factory settings, booted into safe mood, nothing had an effect.
Should I submit a bug report?