I am running Thunderbird 115.5.2 and use the "Remove Duplicates" add-on. Until last week it worked ok, but recently it can't find duplicates anymore. I created a TEST-folder and there are 6885 messages in it. There are multiple duplicates for each email and yet Remove Duplicates tells me: "No duplicates found". I have attached a screenshot. Sorry, I minimized certain columns for security reasons but you can see there are many duplicates present. Can somebody shed light on this? Is there a bug in the current version of Thunderbird? Thanks for your help!