Eater Of Worlds Altars Not Working Properly: Horned Scarab of Pandemonium

Hello, found a possible bug that Horned Scarab of Pandemonium is not Working as intended as it should with Eater Of Worlds Altars maybe also Searing Exarch Altars aswell.

Following Problem: "Final Boss drops # additional Currency works as intended on Atlas Map Bosses spawned by the Scarab, but it doesnt seem to work on "Final Boss drops # additional Expedition Scarabs". It only seems to work on both effects while killing the Map Atlas Boss of the Map. So basically it could be that any Scarab based final Boss kill doesnt work as intended for the Bosses spawned by the Scarab even though the wording is the same.

@edit: Pandemonium Scarab works intended with Memory Maps Future Rewards e.g "Final Map Boss drops # Scarab".