TMSFNCWXPDFViewer with WebCore LoadFromBase64 error

FNC TMS FNC WX Pack
6

Hi
Base64 part is collected from a JSON as an xData answer

{
    "$id": 1,
    "success": "true",
    "error_messsage": "",
    "filename": "report.pdf",
    "PDFbase64": "JVBERi0xLjYKJcOkw7zDt...."
}

string PDFbase64 is collected and sent directly to LoadFromBase64
Same string copy paste and decoded by https://www.base64decode.org/ is displayed perfectly