From the definition of battle turn in Editor/Battles/Battle System/Turn Based/Turn Based Setting/Schematics, battle turn is supposed to change count only after all combatants selected and performed their actions.
However, from my observation, the battle turn start/end schematics runs once during every combatant turn, in this manner a battle turn = combatant turn. Is this intentional for multi turn mode or a bug?
If it's intentional, is there any other way to implement a global turn for all combatants?
You could implement a custom system via turn start/end schematics of combatants and using selected data. E.g. at the start of the battle, store all combatants in battle into selected data. Each turn start (or end) schematic removes the user from that list, once the list is empty, a new overall turn started (refill the list again).
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