This is a nerf, like the ti tool stats..saying it was a bug was probably a lie in the first place.

Same experience here.

Did they reduce drop rate?

The biggest issue with oasis is they sum to a wide uncaring about their f2p player basis a total uncare to what comes together with the implementation of a new feature.

The ti tools nerf for example wasn't a bug, just a direct consequence of the introduction of ultimate training and charms, but when oasis gave the ok to it didn't ask to the chinese developers what would have been the consequences of doing so and didn't warn us beforehand.

The same very likely happened now, with 4.0 and cave keys.

What is the nerf in ti tools?

Before ultimate training implementation brothers farewell tools had only gold secondary stats and with an higher tier than the current ones. Red gourd secondary stats were comparable or better than ninja tool essence. De facto, whoever had the chance to get and reforge tools at that time owns 30-40 more secondary stats per tool and own tons of +4 elemental resistances.

I'm sure we found several things different since 4.0 it's been updated and this is the one it's been updated without notification

too.

Wow, that's a great nerf! They didn't even bother to change it. -_-

Hehe, seems you are the only one with luck here. Grats! :D