If you want to "fix" the (Cleric) healing yourself, you just have to remove all the regrowth line of spells from Druids and Shaman in
npc_spells_entries or don't roll a Druid/Shaman bot + Cleric bot in the same group. The Cleric isn't super smart, post 39 he will only do a 4 tick HoT on damage and then wait for CH (no middle ground direct heals), but it does work. It's especially worked well for me once I started playing a Shaman as my class. As long as I can get something slowed, the long wait for CH + whatever I might toss out for heals gets us through.
My wife and I are playing on a private LAN server with rev 1038 and we have been doing well in a single group together with 4 bots, or even as a mini raid with each of us leading an additional 5 bots. She plays a Druid and I play the Shaman so we don't encounter the regrowth buff = zero direct heals bug.