To reproduce that behavior, will use a direct link Reproduction Link
as you can see, the error shown as html instead of clear Error generating QR code. (Error: Too much data) message
<iframe src="data:application/pdf;base64,RXJyb3IgZ2VuZXJhdGluZyBRUiBjb2RlLiAoRXJyb3I6IFRvbyBtdWNoIGRhdGEp" style="width:100%;height:100%;border:1px solid #ccc;"></iframe>
To reproduce that behavior, will use a direct link Reproduction Link
as you can see, the error shown as html instead of clear
Error generating QR code. (Error: Too much data)message