Teleporting after killing final ACT 3 normal boss may cause lost of the loot.

After finishing the final ACT3 normal difficulty boss fight, I took a teleport to disenchant items to make room for the loot.

Without any warning, I was teleported to ACT1 Cruel. I didn't figure out how to get back to the boss room, if that was even possible.

It is one of the oddest experiences for someone playing the game first time. The game punishes player for using teleport, spoiling the achievement of the boss kill by such random unexpected behavior.
As obviously player just lost the loot after successful boss fight for completely bizarre reason.

Not sure if there was any hover info on the teleport, but really, noone expects its behavior to completely change, people just open it and click. Game should communicate this clearly, i.e. by a simple modal dialog or just a different entry point to the next difficulty.

This happened to me just now. So anti-climactic. Didn't get the loot, didn't get the lore or story since I didn't talk to the NPC first. Feels like I was robbed of the "ending" of the game, or?