Dying sun can't get charges

While doing legion on dunes with 3x legion, 1x legion of eternal conflict, 1x legion scarab of officers.
the flask works fine, but when I get alot of headhunter stacks, the dying sun flask, stops getting charges,, when I remove the flask it's doesn't reset

There should be no HH modifier that causes the player to lose charges. And removing the flask in the map will just cause you to lose the charges, not refill them like in the hideout.

There's only 2 scenarios I can think of that would cause it be essentially unusable in the map:
1. Running a map explicit modifier atlas tree with reduced flask charge modifier map modifier. Partial charges are tracked, but it will require a lot of kills to fill the flask if you're running 90% reduced charges gained for example.
2. Running Exarch altars. There's one take charges and prevents flask charges gained after being hit. And one for reduced flask duration/increased charges used and with enough altar effect or stacked mods, you can make Dying Sun either cost too many charges to be used, or only last for a fraction of a second when activated.