As an additional data point -
I have a very similar setup to the OP - MBP M3 Max, Dell UD22, 3 x Dell U2723QE
Two monitors connected via DP, one via HDMI
all ran fine upto and including macOS 15.3 but the HDMI stopped working since upgrading to macOS 15.4 and then 15.4.1 (when connecting third monitor to USB-C instead of HDMI, the monitor blinks on and off with a time period of about 20 seconds)
running DisplayLink driver 1.12.1 and UD22 has latest firmware from dell.com
it sounds like a fix is on its way so that's great news - in the meantime I'm connecting the third monitor directly to the MBP with USB-C
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