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Each TM match that was populated into the target segment during the project analysis (the target segment was filled with the translation from the TM match) should be kept on the list in the Matches tab of the docked panel even if its score, status, target or context has been changed.
If such a TM match has been modified and returning it in the same form to the Matches tab is not possible, the match should be maintained but marked with a warning (by hovering the cursor over the warning icon, as an explanation of why such a marking is used in the first place).
The idea is to ALWAYS keep such TM match that was populated during analysis of the initial project with such a warning even if it no longer meets the criteria. In this case, the information in the warning might be a little bit misleading. The match was not changed in anyway, but, as was already mentioned, it no longer meets the criteria. The criteria in this case means that a new TM match appeared that is more recent and has the same source and text. Therefore, the older match is filtered out as a duplicate match