Of all the problems, this seems insignificant but would get increasingly annoying and possibly dangerous (at night). It's like when I had a coolant leak and every time I rode the bike on the highway, I had coolant streamed down the left side, coating my boot and pant leg.
Again, longshot there's a dedicated fuse. I've never seen a thread for cracking open the dash panel. Mine (gen 1) is an older LCD back-lit display. So could be bulb(s). New dash is not cheap so I'd start sourcing a part-out. I got a great deal on an OEM radiator from a company that posted full walkaround, startup and basic function test of the bike they were parting out. You could then operate on bad unit. If someone has the disco dash problem, you'll have a quick sale. Probably some dealer intervention to reset odometer and security?
I would live with it and just run a navigation app with speed/distance up. I don't ride a lot at night but also don't have speed limits to worry about. I reference my gear indicator more than my dash, honestly. Good luck.