but manually executing your script from your desktop graphical environment is not the same as a script autostarting on boot, right?
I would say you can, but I never tried.
You can put two commands in one .desktop file anyway (you wrote script, I assume it was a mistake the four times you wrote that, and you meant a .desktop file added in the autostart folder).
I had the same issue, with my bash file that loads a Alsamixer Profile for my Soundcard, after a Kernel Update it looks to me that Auto Start Scripts (for non App Scripts) no longer working since above a 1year now.
I solved the Issue, with adding 2x Nvidia X Server Settings to autostart but i renamed the first Profile under General and under Application>Name, in this way i could link 2 Profiles to 1 Application.
I think autostart scripts work anyway. However, my autostart script in KDE are found in the autostart folder, not the autostart-scripts folder. Add your script in KDE from the System Settings dedicated page.
My script also showed up in Autostart folder, it looks like a additional link for KDE or something like that… i never openend this file with kate and i deleted now the nvidia.sh file.