Atlas map resets on a death in a boss room

EVERY ATLAS MAP COMPLETLY RESETS AFTER YOU DIE ON A BOSS, with all mechanics and other stuff. It's just completly wipes. All mobs vanish, map completly re-generate itself on a new same seed

even if you have more attempts
You can kill boss, but cant finish the map and need to run it again

This is normal behavior if you die to a map boss.

If it is normal behavior, then why do we need attempts?
And why map COMPLETLY wipes?
It is annoying!

This is intended behavior. There is a tutorial popup before you enter a map boss for the first time telling you so.