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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.