Had a CEO who extolled how much better open plans were, how vibrant it made the workplace, and so on and so on... Years later she admitted it was just to save money. I refuse to call an open office an "office" - that vibrant office she described back then? Full of people wearing headphones to block out all the noise they otherwise couldn't escape.
I think the key question here is: are you using GS1 identifiers? If not, I don't think it'd make much sense to throw a non-GS1 identifier in there and expect anyone else to be able to use it. Or is this just internal?
I'm not familiar with that scanner, however that sounds like a scanner issue. I haven't had that issue with GS-128 with the couple scanners I & colleagues have tried. I did a google search and in the Amazon reviews there is someone purporting to be from the manufacturer saying to email them to learn how to make it work, with regards to FNC1.
Can you determine what USB HID code(s) the scanner is sending for that? (Perhaps using wireshark, or usbmon on linux, …) Some years ago I worked on ChromeOS keyboard input, and I can probably tell you right away what it'd do with it. Basically, is the USB code in https://source.chromium.org/chromium/chromium/src/+/main:ui/...
We haven't used Chromebooks, sorry. For scanners a number of cheap to pricey ones were tried. On the cheap end I don't have the exact model number but I think it was about $30USD from Netum, as well as using apps in cheaper smart-phones using the built-in camera.
I'd guess it's the scanner though, I don't think those control characters are supposed to be sent.