Scan finds other printers insted built-in printer named "Inner Printer" with no mac address

[rogerthedeveloper]

I have a Terminal with thermal printer included,
I was getting a list of near Bluetooth devices but my built-in printer doesn't listed, the printer works fine with some generic apps from playstore for test, I'm using Android, and the printer appears in the Bluetooth devices but not in the scan results inside Flutter app, however other devices appears available

[osinglee]

https://github.com/andrey-ushakov/flutter_sunmi_printer