More testing needed, but the dungeon bots seem to not be willing to help in fights against certain dungeon enemies. I've encountered this in Utgarde Pinnacle. At start the bots helped me kill non-elite skeletons and also the first 2 packs of "viking" enemies without issues, but whenever I attacked the abominations (Patchwerk-like mobs), which were the next enemies in the way, the bots refused to engage.

I've tried porting out and back in. I've tried attacking and fighting for quite a while both of the available abominations - 1 can be bypassed, the other one needs to be cleared in order to proceed deeper into the dungeon. I've tried killing other mobs (the 2nd pack of "vikings") in between the abomination attempts to confirm the bots were still working, and they worked fine on those, but still not on the abominations.

I was doing the dungeon as a tank - guardian druid. I haven't tried doing it as other specs and I also haven't tried other dungeons yet.

Not sure what rules currently control the bots, but at the very least the bots should attack anything the player is in combat with, preferably player's target if it exists, and the healer bot should definitely heal the player if player is taking damage (my healer bot would have let me as a tank die to those abominations if I were not able to heal myself until I gave up and ported out of dungeon to save my life, although it healed me ok on the other mob packs - skeletons and vikings).

Player XP gained from gathering herbs and mining needs adjustments - it's way too low at the moment and doesn't even seem to work for herb gathering beyond herbalism skill level 51. I think the herbalism issue is related to the fact that even quite high-level herbs stop giving skill-ups long before they should, and this in turn is likely related to item/object level settings in database + possibly wrong formulas for calculation of skill point gains and player XP.

This is the best resource/description I could find on the topic of player XP from herb gathering and mining so far, but more research will likely be needed in order to get the system working in a Blizzlike fashion (most notably it'll be necessary to find and implement correct levels for each herb and ore node and items they can yield):
https://wowwiki-archive.fandom.com/wiki/Formulas:Gather_XP

Herbalism nodes need skill level adjustments - they stop granting skill-ups way too early. My herbalism profession is at skill 51 and I'm no longer getting skill-ups from any herbs in Vanilla zones (one should be able to get to at least skill 300 in the Vanilla "endgame" zones gathering Mountain Silversage and other high-level Vanilla herbs). I've also tried Felweed, which is first TBC herb one encounters after entering Outland, but that doesn't give skill-ups at skill level 51 either. I'm heading to Northrend now, so I'll report in comments if I find any herbs that still let me level herbalism.

https://warcraft.wiki.gg/wiki/Pet_Battle_System#Experience

I've fought a lvl 5 frog with my lvl 5 raven. My team had 3 pets on it, all lvl 5, but only the raven participated, so the other 2 pets shouldn't be getting any XP in this case (and they indeed didn't get any XP, so the issue isn't caused by XP being split). Defeating the frog awarded my raven 23 XP. This is way too little - based on the formula on the provided website, it should have gained (5 + 9) * (5 - 5 + 5) * 1 = 14 * 5 = 70 XP. Of course, in a more complex battle situation the formula alone isn't enough to calculate XP for each pet correctly, so please refer to the provided website (and possibly other sources) for more detailed info on the XP calculation in specific scenarios.

https://www.wowhead.com/quest=31316/julia-the-pet-tamer https://www.wowhead.com/npc=64330/julia-stevens

When I defeated Julia Stevens in a pet battle for this quest, she disappeared instead of staying where she was and letting me talk to her to hand in the completed quest. This shouldn't happen.

If the first battle pet on player's team is dead, it still enters battle when the player starts a match (for example against a wild pet). This makes no sense, it should automatically be skipped and the next pet on player's team should be used instead. And if all pets on player's team are dead, it shouldn't be possible to start a match at all.

Even though it should be possible to have multiple (up to 3) copies of (almost?) all pets, and indeed multiple copies of the same pet can be caught through pet battles in the wild, it is impossible to add more than 1 copy of pets that are "learnt" from items, for example cats from the cat vendor in Elwynn Forest. The item is "consumed", but if a copy of that pet already is in the Pet Journal, another one is not added, even though it should be up to the total number of 3.

Here are some examples of pets from items that I've tried to get so far:
- https://www.wowhead.com/item=8485/cat-carrier-bombay - https://www.wowhead.com/item=8501/hawk-owl - https://www.wowhead.com/item=8487/cat-carrier-orange-tabby - this one is interesting because this pet can also be obtained by "learning it" from various beginner pet trainers like a spell, and in that case it is actually possible to add another copy of it to the Journal, so the whole issue seems to be more likely related to the processing of the items that "teach" pets, rather than to concrete pets themselves

https://www.wowhead.com/pet-ability=538/devour

Battle pet ability Devour doesn't heal the pet that used it when the enemy gets killed as a result of that ability.

Battle pet ability Cocoon Strike has these issues:
- visually casts twice, although the damage effect is correctly applied only the first time
- doesn't apply the cocoon shell effect that should block 1 incoming attack and last 1 round, so either block the incoming attack in the round the ability was used if pet that used it went first, or block incoming attack in the next round if the pet that used it went last
- prevents player from swapping the pet in the next round after the ability was used

For more details on how this should work, check also comments here:
https://www.wowhead.com/pet-ability=506/cocoon-strike

When battle pet survives until the whole pet battle match is over and won by the player, it should recover part of the health it lost during that match (even if it was swapped for another pet at any point), but it doesn't.

I couldn't find any proper source describing how exactly this should work, so I've attached the AI response from Google Search because it seems to be correct based on my previous WoW experience.