So upon learning of the new enduring mana flask mod I was very interested in testing it with Indigon. I wanted to see if life recovery from the Indigon mod, "non-instant Mana recovery from flask is also recovered as life," kept restoring life even on full Mana while using an enduring flask.
They indeed do. I'm sure most of you are also aware that you can stack the duration up with these flask by spamming them.
I'm currently playing a Pathfinder to take advantage of this and of course using MoM. The raw recovery is kind of ridiculous.
I also tested this interaction with the Sorrow of the Divine unique flask. It does not give you ES recovery under ANY circumstance with this interaction.