Get a binary artifact that was created before the QR was reported (ideally, the reference build)
Get a recent artifact that has a QR on an unmodified code (ideally, the latest build)
Download a Decompiler tool called ILSpy (open source, MIT license, free) from
Open the tool and drag the (1) to it, then locate a method that was reported as QR. Its contents will be visible on the right column. In the toolbar change the language from C# (default) to IL, and make note of the result (better - save it to a file)
Do the same for (2), and compare the results.
We expect (4) and (5) to differ, we just don't have enough information to tell why that change occurred.