Been trouble shooting this for a while.

Create a function loop with breaking criteria

execute unless entity @s[tag=break] if entity @s[scores={Count=..499}] positioned ^ ^ ^0.1 run function methods:test/loop

In the same file, create a command to run if loop breaks.

execute if entity @s[tag=break] positioned ^ ^ ^ run function methods:test/saysomething

Expected result, Breaking the loop causes saysomething to execute once providing a single message.

Actual result, Breaking the loop results in saysomething spamming the screen.

I do not believe the positioned tag has anything to do with it but I left it in to show how im using it.

( *** Edit *** ) It just occurred to me that this is not necessarily a bad thing as some functions may benefit from this sort of behavior. I would like to suggest actually making it official but activated by some sort of parameter at call time.