XFA 2.x form not invoking XFA engine

[JDziurlaj]

Attach (recommended) or Link to PDF file here:
Purchase Order-withAcroFormsInj.pdf
XFA APIVersion 2.2.4330.0
Configuration:

• Web browser and its version: Firefox 89.0
• Operating system and its version: Windows 10 10.0.19043.1052
• PDF.js version: commit a4546e8
• Is a browser extension: No

Steps to reproduce the problem:

1. Enable XFA Support
2. Load example PDF

What is the expected behavior? (add screenshot)
XFA version of form loads
What went wrong? (add screenshot)
AcroForm form loads

(I added a value in the AcroForm to differentiate them)

(Form is an example from Adobe LCD 7.0)
Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): N/A