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Get a binary artifact (EXE, DLL) 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 https://github.com/icsharpcode/ILSpy/releases
Open the tool and drag the earlier artifact (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 the later artifact (2), and compare the results.
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We expect (4) and (5) to differ, please share with us the detailed information from this tool to help you understand why that change occurred.