Thanks for playing! And wow that is interesting >vv< lol, I will definitely look into this for the next release. Thanks a bunch for reporting it and getting so many details! They've always been a bit silly and buggy here and there, but I definitely don't want it doing this obviously!
Hopefully you can't save with a messed up team with invisible/nonexistent members, or if you can that it automatically fixes it (I can't remember if I added a failsafe for that, but I'll make sure one is in next release in case that does somehow happen) ^vv^ thanks again!
I didnt even think about saving haha, i decided to give it a try and it does allow you to. When reloaded you will still have an empty team. However now if i add a team card, the leader will be Level "100" and editing the team to view the invisible partner or anyone you add behind the lead will be displayed as Level 100 MWMWMWMWMWs.
(i had an image showing it here but unfortunately Itch's image verification failed)
As expected though, attempting to expedition like this, edit the MWs etc. Will lead to the same previous soft locks. (too bad, i would have loved to do a match with my level 20 100 :3) The fix still just being to close the game or add your own monsters and not a team card c: