Infernal Flame, Max Mana stats causes swapping weapons to inflict self destruction.

Misunderstood what was going on initially and posted it as a bug report before discovering the culprit ...

To put it simply, If Max Mana is present as a stat on one weapon and not the secondary weapon then switching that Staff during combat (For purposes of secondary weapon passive tree swapping for dual element playstyles) will cut my Maximum Infernal Flame as the weapon with the +Mana stat is no longer equipped.

If this swap occurs when Infernal Flame is below the cap for the +Mana weapon but above the cap for the one with no +Mana stat, I explode immediately.

This effectively limits the Infernal Flame cap to whatever my Max Mana would be with the secondary weapon equipped even when it is not equipped, as passing that threshold and swapping weapons causes self destruction.

Weapon Swapping is then inherently discouraged unless I somehow manage to luck out and get the exact same +Mana stat on both weapons.
This makes getting +Mana stats on a weapon actually dangerous as even a slight variance in the Flame cap can cause an instant self destruct on weapon swap.