Mana Flask Emptied After Swapping

I just picked up this new flask called "Opaque Medium Mana Flask of the Apprentice" and swapped it for "Medium Mana Flask of the Wide". The latter flask was full when I tried equipping the other and I remembered that new flasks contain no charges. When swapping back for my initial flask it had emptied.

This happened at Cemetery of the Eternals.

As far as i know, this is intended.

This is as intended. It's always been like that, even in POE 1. It's to prevent people from cheesing by bring in a whole inventory of filled flasks to swap in and out during a hard fight.

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Alkwraith#2136 wrote:

This is as intended. It's always been like that, even in POE 1. It's to prevent people from cheesing by bring in a whole inventory of filled flasks to swap in and out during a hard fight.

Wouldn't it be possible to just let 1 flask at a time remain filled? Besides that, I just picked up my first charm and I read the description which had me read the description of the flasks. You guys are right. It is intended.