Ok peoples I did some digging around the forums and while I was unable to unearth a definitive answer, I did find a few posts which relate to this issue:
So based on the reports, it would seem that this Perk may not have been functioning correctly beforehand. However, the recent patches including the Quality of Life patch and the Unnamed City overhaul post date this. Listed below logged changes contained within patch notes. As you will now see, both the Receptive and Gluttonous Gains Perks have both been adjusted.
The “Receptive” perk now grants a x2 bonus to healing instead of x1.25 - the result of the 1.25 modifier was that all healing got truncated down to the lowest integer, meaning that the perk did not have any effect on heals with lower than 2 points
“Gluttonous Gains” perk (Vitality 50) now grants a bonus heal at the beginning of eating rather than at the end. This effect can only happen every 30 seconds
Based on the above adjustments, and growing number of reports, I tentatively offer two possibilities. The first is that this was indeed an unannounced(?) nerf. The second (which I do genuinely hope is the case) is that in adjusting the the health regeneration values/rates for the two aforementioned perks, it has unwittingly changed or upset the regeneration rates for “Fierce Vitality”.
Although the change to ‘Receptive’ is a little unclear to me in terms of what it is trying to convey.
Would anyone of you like to weigh in or shed further light on this issue?