We encountered a similar issue with QLThumbnailGenerator
It stopped generating thumbnails of type .icon starting iOS 18.3
The generateRepresentations() would succeed without errors. However, the resulting image would be incorrect. It looks like some kind of a placeholder:
I see the same error message in the log
Error returned from iconservicesagent image request: <ISTypeIcon: 0x30041a100>,Type: com.adobe.pdf - <ISImageDescriptor: 0x303bea620> - (100.00, 100.00)@3x v:1 l:5 a:0:0:0:0 t:() b:0 s:2 ps:0 digest: B19540FD-0449-3E89-AC50-38F92F9760FE error: Error Domain=NSOSStatusErrorDomain Code=-609 "Client is disallowed from making such an icon request" UserInfo={NSLocalizedDescription=Client is disallowed from making such an icon request}
Thumbnails of type .thumbnail work correctly. They are generated the same way as they did before.
alex9403
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