I managed to bring both screens up at 30Hz by passing video resolutions
as kernel parameters

video=DP-3:3840x2160@30 video=DP-4:3840x2160@30

This means I do not have to do any display port replugging on startup.

I still have to manually change the refresh from 30Hz to 60Hz in the
settings. If there was a way to do this via cli, I would have a full
workaround for this issue.

I also noted that I was actually loosing the displays earlier in the
boot process, maybe at some DRM/framebuffer loading point, as I was not
seeing the extra few seconds of green service [OK]s, prior to wayland.

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https://bugs.launchpad.net/bugs/1968235

Title:
  Dual DP 4K @60Hz requires toggling to 30Hz and back to 60Hz

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