Missing Add-ons 16.1 to 17.0

Hiya just a quick question. When I migrated from 16.1 to 17.0 in the early day I ended missing a whole bunch of my add ons from shortcuts or maybe altogether. I had 5 icons under VIDEO for example but only a few appeared after the upgrade. I decided to go back to the 16.1 skin and they were all present without doing anything other then reverting back a skin and they also functioned fine. I’m just curious if this was an isolated thing or has it happened to others? Maybe a fix has been done since then? I’m just cautious about upgrading on other devices because of this weird behavior.