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the bluetooth scanner you are trying to use is essentially a keyboard. This is how it can write the scanned value into a field, like the scanner is typing the barcode number into the field for you.
I doubt there would be a way you can override the default behavior.
However, FileMaker Go has had native barcode scanning built in for a few years now using the iOS device camera. Is there a reason that you can't use the built in barcode scanning abilities?