Whenever the boss changes phases, the first Charged Spear on the phase is detected badly.

The addon consistently announces the spear target to be the boss target, not the spear cast target.

Consistently reproducible on all difficulties

There was an update for this 7 hours ago with 1493101

Could you please try those out and let us know if this still happens?

I will definitely do that.

The change was not reflected in the latest patch notes I was aware of, so I thought it wasn't fixed yet

Maybe your updater did not have it available yet, as it was only in the alpha.

It actually works now! Good to know