I'm trying to test a startup script, but it gives me an error that "cannot run startup procedure while indi devices are not online". My devices are all online though.

Searching for that error returns very few results other than the actual code. I looked at the code and found a comment that says
/* FIXME: Probably issue a warning only, in case the user wants to run the startup script alone */
github.com/KDE/kstars/blame/d204d72372cd.../scheduler.cpp#L6247

I'm not an expert, but it seems like the logic is checking to see if indi is idle vs. actually offline and generating an error. Not sure why being idle would cause any problems, and it would be an easy fix just to eliminate that one bit of logic to enable the script to be run manually.

if (indiState == INDI_IDLE)
        {
            KSNotification::sorry(i18n("Cannot run startup procedure while INDI devices are not online."));
            return;
        }