Greetings! This is a known issue and Bungie is investigating. [quote][...] we are continuing to investigate a fix for existing armor pieces that previously lost their Artifice mod slot.[/quote] via the [url=https://www.bungie.net/en/Explore/Detail/News/51446]6/9/2022 TWAB[/url]. Bungie has provided a timeline [url=https://www.bungie.net/en/Forums/Post/261131996?sort=0&page=0&path=1]here[/url] (that is subject to change) where they hope to get this fixed by next season, which starts on August 23rd, 2022.