Why godot4 debugger's error massage is different between mobile and compatibility mode. Is that BUG?!

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:bust_in_silhouette: Asked By nagne

When it start new project, we can choose one of them(Forward+, Mobile, or Compatibility mode). Nowadays, I restarted Godot4.0.2 and i had a problem. my code got error massage but in Godot 3.5.2, this code was correct code. So i just change from Compatibility to Mobile mode. in Mobile mode, it show me no more error message. So i am wondering, it just looks like one of bugs?!

ttt