I've also checked several others and can't see any other A220 with a serial number that doesn't match the various online sources. The one I tried to check but couldn't was, ironically, 55236 which should be LZ-LON at Bulgaria Air.
I'm also not convinced that Bombardier, let alone Airbus, would have line numbers which so closely resemble MSNs, given the two usually have very different numerical sequences.
As Brenden says, someone at NJS/Qantas would have entered that number and I'd add that it will need to ultimately match the aircraft's placard and papers.
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