Blizzard is deploying a Hotfix that will temporarily allow players to receive Potent Blood that is stuck within Blood Wells.
Patch 1.2.2 Hotfixes Incoming Horadric Vault Complete Collection
Additional Hotfixes are expected to permanently resolve this as well as other Season Journey progression issues.
Blood Knight Could Come to Diablo 4 Mini-Pets are a Possibility in Diablo 4