Bugs also wasn’t ever coded as a baby bunny. Even though Tweety’s actual age is indeterminate, the character design has always been clearly a baby bird. Early on, Tweety was absolutely a baby bird although over time his age has become indeterminate. The character design never changed to reflect that, it still stayed baby-like.

Bugs, Daffy, and Porky get away with it because they are coded as adults, and as you have pointed out, also have a history of crossdressing.

Tweety being coded feminine isn’t the problem, it’s a baby having big yabbos that is.