I needed to replace the ZXing.Net.Bindings.ImageSharp package to ZXing.Net.Bindings.ImageSharp.V2 and the code started working by using the ZXing.ImageSharp.BarcodeReader<Rgba32> reader class. It doesn't need any arguments.
ZXing.Net.Bindings.ImageSharp
ZXing.Net.Bindings.ImageSharp.V2
ZXing.ImageSharp.BarcodeReader<Rgba32>