Qr : Read and Create Qr/Bar Code offline

Testing this in companion, I get a list of formats:

["AZTEC", "CODABAR", "CODE_39", "CODE_93", 
"CODE_128", "DATA_MATRIX", "EAN_8", "EAN_13", 
"ITF", "MAXICODE", "PDF_417", "QR_CODE", 
"RSS_14", "RSS_EXPANDED", "UPC_A", "UPC_E", 
"UPC_EAN_EXTENSION"]

However, only QR_CODE and PDF_417 generate an image/code.

Is there are reason for this?

(tested on Android 10 and Android 11 devices)