I can recall, I followed advice from release notes https://developer.apple.com/documentation/xcode-release-notes/xcode-13_2-release-notes i.e. I applied defaults write com.apple.dt.XCBuild EnableSwiftBuildSystemIntegration 1 -- after this my "troubles" with quick help started. You might try this - it helped me. defaults write com.apple.dt.XCBuild EnableSwiftBuildSystemIntegration 0

Please note: Accepted Answer unfortunately does not solve the issue. I would edit it - but you can not edit/delete in this forum.... So much time wasted here.

Found solution 😂 Install Xcodes app (you can have GUI or command line version), see https://github.com/RobotsAndPencils/XcodesApp. Install last Xcode version where Quick help works just fine - this seems to be version 13.1 (13A1030d). 2.1 Make this version active (i.e. switch command line tools to this version) and open Xcode (test - it should work). Make your version 13.2.1 Xcode version active (i.e. switch command line tools to this version), open Xcode and try - it should now work. Howgh.

Removed Xcode and all Xcode related - not solved. @Apple really? PS: Experienced other issues: 1) installation from Apple store gets stuck (solution is - not to use Apple store) 2) Missing simulators + you can not install simulator with old version of iOS 😱

Deleted ~/Library/Developer/Xcode/DerivedData and ~/Library/Caches/com.apple.dt.Xcode + restarted Xcode --> not solved.

Found only three files in /Library/Developer/Xcode/DocumentationCache/v207/13.2.1/DeveloperDocumentation.index - does it proves the documentation is missing?

Installed "command line tools" --> not solved.

Tried defaults delete com.apple.dt.Xcode IDEIndexDisable - but there is no com.apple.dt.Xcode on my machine (i.e. Domain (com.apple.dt.Xcode) not found.) --> not solved.

Deleted ~/Library/Caches/com.apple.dt.Xcode --> not solved.