Try searching for "updating took more than 5 seconds" (with the quotation marks) and you will know that DevForums's current search is not working as expected. I have downloaded the Feedback Assistant - https://developer.apple.com/bug-reporting/ application on my mac to file a bug report, but I couldn't find a section for the developer forums.

Under which section should I file the bug ? I couldn't find any section related to Apple Developer Forums.

I'm using Safari 13.1.1 (15609.2.9.1.2) on macOS 10.15.5. I clicked on a topic/question, which took me to its page. I pressed ⌘[ and nothing happened.

@OOPer I wanted to upload a picture for the attribute information, but I didn't find a way to do so in the forum. Anyway, you can find its information below: Attribute Name: content "Type": Transformable NON-OPTIONAL NON-TRANSIENT NON-DERIVED "Transformer": EMPTY "Custom Class": NSAttributedString "Module": EMPTY

@OOPer I have just tried what you said. The app crashed with the following error: >>> Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Object of class NSConcreteMutableAttributedString is not among allowed top level class list ( NSArray, NSDictionary, NSSet, NSString, NSNumber, NSDate, NSData, NSURL, NSUUID, NSNull )'

I have ended up using a separate entity for each attribute (color, alignment, etc) and the application is working now as expected. Thank you @OOPer for your help.

same issue here...

I have solved this problem by removing my iPhone from the Devices List in Apple Developer Account.