A player recently insisted that if a character identifies that something is an illusion, then that illusion becomes translucent to the character.
The example was given that the wizard could make an illusion to hide the party, but because they know it's an illusion they can all see through it, but enemies the other side can not.
This runs differently to how I have always run illusions, yes your character knows it is an illusion but it is still solid and still can't be seen through,
I have tried reading through the rule book to find the RAW approach but can't find it, is there one?