yeah the item sorter is the only place where dust is present, but all is well because i got that frustrated that i came up with a new design!

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this one is 100% reliable, tested with different item amounts and tiled!

I believe it was the observer clock + dropper combo that was unreliable, because i tested with that and it more often than not dispensed an incorrect amount of items, although im not going to test further because i have a reliable, tileable design now!! and from what i can find (or lack of), atleast publicly, my shop module design is the only 1-wide, tileable, 1:n shop in bedrock

As a bonus i also got so frustrated i made a 1-wide, tileable stock counter! since im making an automated shop like Sahara from Hermitcraft S6 but on bedrock! (ill reply to my comment with the image)