Thanks for posting the video. You're correct, there's nothing in the chords to cause the chord change and it's clearly there. Rharv's correct that it will likely be best to let support examine the file. I asked someone knowledgeable about XML files and they told me a chord change would be obviously visible and they did not think the XML file had any thing to do with your issue. This test you did seems to confirm that.
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BIAB Ultra Pak+ 2021:RB 2021, Latest builds: Dell AIO; Windows-10-64 bit, AMD A9 Processor and 16 GB Ram Memory.