When you visit the する entry (https://www.japandict.com/%E7%82%BA%E3%82%8B?lang=eng#entry-1157170), it seems to be missing the verb conjugation you see on other entries, including 来る. This leads me to believe it's a bug.
I think a side effect is you also can't search directly for some conjugations like して or します.
This is probably why:
fr3nd Finally, I detected another bug more complicated to solve, affecting the following irregular classes: suru verb - special class and suru verb - included. As this would take some time to fix, I've decided to temporaly disable conjugation on these verbs. here
Ok, thanks for the information!
Yes, that's correct. I had to disable the conjugation in this specific verb for the moment. I'm sorry for the inconvenience.