I will look into all of thesse and fix what i can. Thank you for your detailed analysis
To be precise, these are all event logic bugs; the character art issue is a switch error.
Also, a common problem with engines from RPG 2003 to the present: A delay buffer (i.e., event waiting for sorting) must be added to events. Otherwise, processing two events concurrently will cause soft locking or the second event to become invalid.
Even if the event needs to be activated later, an empty event prerequisite should be added according to the layer, and then enabled using a switch to prevent the "no prerequisite refreshed" bug.