Thank you for your kind words, Anceane, they are appreciated. I am going to respond to the points you raised in your reply to the best of my limited abilities.
Regarding the CustomTitles add-on, FCMQT does not use this add-on now. It may have in the past but it does not now. I looked in the FCMQT add-on code to verify this.
Of more importance is that when dependency (Library) add-ons are shown as missing, the new loading rules mean the dependent library (e.g. CustomTitles in this case) folder has one or more of these things wrong with its packaging:
1. It is not in your .../AddOns/... folder
2. It is not in the add-ons list of the ##DependsOn: directive of the add-on that needs it (e.g. FCMQT in this case).
3. It is embedded in another older add-on that you have not investigated. You can use the File Explorer Search feature to scan all the add-on folders in your .../AddOns/... directory for the extra (and probably very old) embedded add-on copies.
If you find additional copies of the "missing" add-on embedded in other add-on folders, then you will have to repeat the find it; delete it; add its name to the ## DependsOn: directive for the embedding add-on cycle, until you have removed all of the offending, embedded add-on copies.
I apologize for asking you to do all this work, but you will have to continue to do this until we add-on developers (including the Minion developers) can update all the existing and viable add-ons to the new loading rules. Most of us are trying our best to get everything up to date; the others are probably not playing ESO as much as they used to play, if they are even playing ESO at all.
I hope this has helped you understand more about the complex world of add-on loading. If you would like to learn more, please click on the ESOUI wiki tab and scroll down through the Content Description entries to the "Packaging" sections at the bottom of the page and read
them.