Life loss from Petrified Blood and Progenesis is not prevented by Grace Period

As the title says, the Life loss from Petrified Blood and Progenesis is not prevented by the Grace Period provided on area shifts within a zone e.g. entering a boss arena.

Normally this shouldn't be a problem since most builds running life loss should have recoup/regen to cover the life loss but I'm using tainted pact to heal from poisons and poison damage is prevented during grace periods. This is leading to deaths in the grace period which I believe should be addressed.

Method to reproduce:
Run petrified blood + vaal pact
Cast forbidden rite until bright red part of life pool disappears
Enter boss room of a map
Life will continue to deplete until death

Grace period prevents damage during the period and technically the life loss damage was incurred prior to entering the grace period so grace periods definition is still correct. Unclear whether this is intended behaviour or not.