Looks like a lot of plasma users are encountering problems with external monitor not working after suspend (or update). Plasma bug?
Edit: looks like two users use Ryzen CPU, maybe unrelated or not.
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I use a second monitor but not suspend so I cant confirm this but it wouldnt surprise me, I give it a week or so and itll be sorted especially with the amount of people using multiple montitors these days
Yeah that’s classical Plasma:
1 bug fixed → 2 bugs created 
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Do you have AMD Ryzen or Intel CPU? Just wondering whether that’s a coincidence or not.
Intel CPU, I also use the LTS kernel over the latest
Whaaaat???
Don’t you know that…
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Bugs??? I call them unexpected features
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Unwanted, undesired…, unheard of features!!
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Wondering if it’s really only affecting amd Ryzen cpu users. For whatever reason. Else seems they have either amd or Nvidia GPU
Sometimes, but they always force me to learn something
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Yeah… blessings in disguise 
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As for those bugs or “unexpected features”, Plasma 5.26.1 has hit the Arch repos on the day of release. The changelog is here.
I’m sure that Gnome 43 will be available soon 
I have never used multiple monitors so i can’t comment. I got no bugs here.
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I’m yet to see any bugs except for 1 that has popped up very rarely for ages now - when connecting an external hdd it sometimes shows it twice in dolphin, but closing dolphin and reopening fixes it
5.26.1 seems to have fixed the occasional problems I had with the taskbar and right-click not always working.
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Bug free of course 
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Guaranteed!
I run it on openSUSE Tumbleweed and Fedora 37 and I haven’t come across a single bug.
My essential extensions are all working. But not being part of the DE itself, they don’t count.
Of course as everything else, it all is a case of varying mileage
But you know the refrain:
There are no bugs in GNOME.
Gnome bugs …
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I Can’t see how it’s the Ryzen CPU, because it’s not an APU (No onboard graphics). If it were the Kernel, everyone would have the problem no matter what DE, but all three of us are on KDE Plasma. 
I filed the bug with KDE:
https://bugs.kde.org/show_bug.cgi?id=460623
They have been very slow even acknowledging new bug requests ever since they started that new method of squashing bugs fast thing. So if they are squashing bugs faster, then at the cost of not addressing new ones for much longer. 
I think they need to slow down adding new features, and fix all of the bugs first, or else they are just building new features on a buggy framework! 
I have more features than I know what to do with, and they have way more than most DE’s, so bugs should be their main priority for the rest of the year, and maybe even all of next year! 
Also, I think the problem is with Plasma not remembering display settings and changes: Move some Icons on the desktop, open some apps and change the windows size and position; reboot: Are they as you changed them, or did the changes not take? if the changes didn’t take, then maybe you too should follow my link and chime in, as KDE are probably the best place to go for this, not Redit, Stack exchange… which is where way too many go when they have issues instead of bug trackers! 
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I also have an AMD Ryzen CPU/GPU laptop recently purchased and it has an integrated AMD graphics. I currently run gnome, but have to see, could perhaps install KDE for testing and bug reporting purpose.
I also think it’s better to do it directly rather than reddit etc… but I guess most people don’t even know how to report a bug properly and have never done so.