Illaoi Spirits accepting Exhausts and Ignite
I'm not sure if this is a bug or not, but it should be prevented. Sometimes when Illaoi sucks the spirit out of an enemy champion, and that spirit is so close to an actual champion that it's hard to put an exhaust or ignite on the actual champion. The Spirit, is not an actual champion, and not intended to even be perceived as the actual champion, and it shouldn't accept a misclick like that for summoner abilities.
Exhaust is wasted on something that doesn't move and doesn't fight back. It's great that Exhaust and Ignite can NOT be accidentally put on minions as that would happen frequently by accident. Same applies here. One might argue that Wukong decoy, or Shaco's clone cause the same problem, but that's intentional as key mechanic of those defensive deceptions because of the decoy aspect of it, you're not supposed to know what is the actual champion. For Illaoi, she knows what is a champion and what is just a spirit.
If this isn't considered a bug, it should at least be considered a Quality of Life improvement to not punish Illaoi players for a mechanic that shouldn't exist.