The recipe is a little wrong. It needs a battleaxe and not a dwarven axe.

Bard has lost the custom spell progression it seems.
Level 9:

Can still see the spells known in my radial menu, so at least that's not gone.

The damage bonus (at level 9 at least) is a bit random. It's not giving 1d6 vs vermin. I've had it give +1, +2, +3, +1d4, when used right after eachother more or less.
Also the damage bonus from this is added to your weapon, which is unfortunate if you have an acid weapon already.
Lastly, the attack bonus is applied to your weapon too, unlike Celestial Concerto.

Version: 221202 Strife 7730

Version: 221119 Shark 7724
Issue:
It doesn't seem to count as a proper weapon? Eg:
Using a throwable like Holy Water on it, makes it state that it is not a melee weapon - so it doesn't apply.

Secondly, using a short spear negates bard arcane spell failure bonus, somehow.

Issue Description:
Basically that the ingame description says it targets enemies, but when using it it also affects party members.

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Server Version: 221114 Puffy 7714
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Issue Description:
Following a use of Geggenar's Golden Gurgle of Goblin Gutting, anyone that's been affected by it, is unable to get the effects of bard songs of any kind.
Relogs have been attempted by me and an affected player, but no dice.
I still get the effects myself though.

Maybe it's an intended side effect or maybe just an oversight.
The duration of Flame Weapon and Darkfire states in game description, that it's duration is Hour / Level.
In effect, it's been implemented as 2 Turns / Level, which in vanilla NWN is equal to an Hour - 2 minutes / Level.
But, due to the change in the duration of an Hour on CoA (4 minutes), the spell duration is no longer equal to the description.

Might just need an update on the Spell Changes, to inform about why FW/DF expires before animal buffs, despite both being described as Hour / Level in game.

Have you tried to cast the two directly after one another, to test if it's not due to the duration of flame weapon ending?

@echo I'll update in case I find it again. I've forgotten where I found it

https://nodebb.cityofarabel.com/topic/59324/premature-ending-of-rage/6
Same issue reported here