Cannot get ZXing to scan dense/wide 2D barcodes

[JayD2019]

Prior to attempting to integrate ZXing Barcode scanning into our Xamarin.Android App (to scan 2D barcodes of drivers licenses using camera), I downloaded and built the following sample app. from: https://github.com/Redth/ZXing.Net.Mobile/tree/master/Samples/Sample.Android.

It needed the latest nuget package which is actually called: ZXing.Net.MobileX.Forms (so it took me a while to realize it was the correct one), with the fix for a crash on invoking the scan but it works now. It is a neat app with a menu of about 4 or 5 button options, of which I only used options 1 & 3.

BUT, It only scans 2D barcodes if they are fairly narrow (<= 1 cm wide) and relatively simple; these scan really quickly. (1D barcodes are scanned fine too)

Dense 2D barcodes and those wider than 1 cm do not get scanned at all - even with the flash on. Do you know why this is and can anything be done? I have set all the relevant parameters I can find). Interestingly, I had the same issue when I tried using Google Vision also.

Thanks