debugDescription in flex_observers leads to crash

[sujinnaljin]

Environment

• Platform+version: iOS 16.2 (Simulator)
• FLEX version: 5.22.10

Bug Report

• When I click NSNotificationCenter.defaultCenter, it crashes about once every two times.
  

• The error point was NSString *debug = self.debugDescription; in flex_observers so when I changed it to NSString *debug = @"";, I checked that there was no error.

  

• This issue can also be reproduced when FLEX is applied in Apple's official example project Implementing Modern Collection Views