I was hoping you would rerun the existing test that consistently failed with Jaikoz 11, I am not clear if you have run the test on Jaikoz 10 with the same boxset and the same match to MusicBrainz step and then Force Save
Other than that the next step is to try Jaikoz 11 on another computer, perhaps you could ask a friend if you don’t have another computer one to check if the issue is specific to your computer or not.