Caster Mastery (open chests) also triggers the petrified amber encounter

Bug report would be : 1,358,862,109

As the title says. The bug would be that it triggers it without showing the petrified amber hitpoints, which I believe makes it invulnerable.

What's weird is that it doesn't trigger all the time, I believe you need to have some actual chests nearby and then when your mastery opens the chests as you cast a spell, it also "opens" the mob spawns for the petrified amber encounter without actually triggering it (as I can still click it whilst I'm killing the monsters). Once all monsters are killed, I get the amber ore as usual and can no longer interact with the tree. No real picture to show it, but it happened to me several times already.

The caster mastery (open chests) doesn't trigger any other ore encounter, which I guess means the amber ore encounter is perhaps consider as a lockbox or something like that.

What I see happening very frequently is that the amber tree encounter just ends without having been started. This seems to happen possibly from enemies near the tree being killed. I have also seen the tree get struck by enemies without the encounter having begun. Trying to clear out the area around the tree before you start the encounter seems to greatly elevate the odds of the encounter not beginning at all, which only yields the player more amber so it's not making me not want to clear the tree first.