[Catalina] Quick Look doesn't extend Sandbox for "related items"

Hi folks,

My Quick Look plugin reads a "related item" in addition to the file to be thumbnailed / previewed. Therefore I implement a NSFilePresenter as described in scenario 2 of the link Apple documentations:

https://developer.apple.com/library/archive/documentation/Security/Conceptual/AppSandboxDesignGuide/AppSandboxInDepth/AppSandboxInDepth.html#//apple_ref/doc/uid/TP40011183-CH3-SW22

This approach worked well until macOS 10.15 "Catalina" (and even works there for the main app). When previewing a file with Quick Look the related item file is not read. I assume the sandbox of Quick Look is not extended to the related item.

Before filing a RADAR, does anyone has a similar QL plugin and observing the same behavior?

Greetings, Mattes

Edit: If I perform the preview using qlmanage the related item is read...