At this point I am going to assume you installed the .iso on Sourceforge, as that is the first link I see in the blue box. Honestly, I have never tried that one.
I just did a quick download and install of OM Rock Plasma 6 using Ventoy of 3896, found here.
Installed to an old dinosaur from 2012, an ASUS K55A, 6GB memory, Intel i5-2450M (second gen), integrated Intel second gen graphics, with the 128 GB SSD. Everything is very stable for an old dinosaur. Even after I ran System Update and rebooted.
You might want to give 3896 a try. However, being unfamiliar with that Nvidia 3050, is it causing trouble? I don’t know.
I have been messing with the LXQt builds for Rome the past few days. My impression is parts are missing. For instance, no dual monitor support and no printer setup unless configuring the printer from inside the browser (http://localhost:631). I did not see a build for Rock LXQt. That doesn’t mean there is not one. It only means that I didn’t dig hard enough.
For the best luck with LXQt, what I have done on my other dinosaur a 2016 vintage ASUS X555UA, is to install OM Rome Plasma 6 and once that is up and running, do a system update, then install the task-lxqt package, which will place lxqt on the same system. Then reboot. When logging in from the SDDM screen, select LXQt from the menu (the one showing Plasma, lower left corner) and then enter your password. You will now have LXQt with the benefit of being able to use the KDE Plasma settings to deal with anything missing from LXQt, such as monitor and printer settings. Plus, if you happen to blow up something in either desktop environment, you have the other to fall back on to correct the problem.
Just now I installed the task-lxqt package to the Rock 3896 installation that I did, rebooted, and everything seems to be fine, other than the printer and monitor setting in LXQt are still missing. I just go into the KDE System Settings and use those to achieve the same goals.
I hope this helps.
Now I will wipe the drive again and try installing the Sourceforge .iso file, just to see what I downloaded. You got me curious.