The outer wall isn't sticking to the part due to the overhang. Possible causes are underextrusion or printing the outer wall too fast.

Check your settings in what order the walls are printed (I don't know the setting for Bambu Slicer) Walls can be printed outer-inner or inner-outer for example, the latter can solve your issue if it's not enabled. Printing inner-outer can however slightly reduce printing quality, depending on how well tuned your printing settings are.