We’ve made some progress on this subject today.
As of this morning, if you get a new Corrupted item and cleanse it, you can re-corrupt it using a Preserved Contaminant from the new system.
Unfortunately, items cleansed prior to maintenance this week remain unwilling to be re-Corrupted.
We’re also working on a hotfix that will add clarity to this, by highlighting Corruptable items in your bags when you activate a Preserved Contaminant. This should be very similar to how scrappable items light up when you use the scrapper.
We’ll let you know when that comes through in our Hotfixes Update post.