(I don’t know about VC1, I haven’t tested it to see if it has the same issue)
This is absolutely infuriating and it seems to have been entirely ignored.
It very clearly says it will give “50 vigour per round remaining” but instead it gives you 50 vigour per SEPERATE BUFF you have active at that time. This means if you have, as I did, 6 rounds of 2 buffs remaining, you will get back 100 vigour rather than 300, which means using the catalyst LOSES 100 VIGOUR INSTEAD OF GAINING 100 AS IT SHOULD IF IT DID WHAT THE DESCRIPTION SAYS
Testing after that I had 1 buff with 2 rounds remaining. It used 200 vigour and gave back 50, because it only counts the single buff as 1, rather than 2 rounds of buff for 100.
Either fix the description so people know to never use it or fix the effect to make the catalyst at least somewhat useful again.