I prefer a patch note, but in my amateur data mining and wayback machine-ing I have not uncovered the Robe of Living Fungus regen removal patch note. I did find a series of Allakhazam comments from 2001 that I feel are solid evidence that this robe had its regen effect until early Velious.
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The first comment I shared I believe is someone alerting the community of the nerf change. Not as solid evidence of a patch note, but I feel he's reviewing patch changes from that time and sharing a juicy item nerf.
https://everquest.allakhazam.com/db/...1&p=2#comments
I belief the nerf to Robe of Living Fungus came far too early and is due January 2001, or the August 2021 patch.