Qt changed the way they do this because of bug reports. EDID blocks are NOT supposed to have the same serial numbers. So what Qt did really should not have hurt but in your case it did.
I still can not figure out why your debug.txt has only two entries. It should list the info for the primary first. And then list it for all screens, primary included.
Can you copy and paste the two edid blocks into a text file and zip then up and post them. I want to try decoding them just to verify that Qt has not messed that up.
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