Form: automated today in form doesn't work correctly

[dolmen]

Document

https://www.ccsce78.fr/uploaded/insc-2023.pdf
(GitHub doesn't allow to upload)
Same document as #16937 (where an issue of XFA vs AcroForm has been diagnosed).

Configuration:

• Web browser and its version: Firefox 117.0
• Operating system and its version: MaxOS
• PDF.js version: Firefox 117.0 built-in
• Is a browser extension: no

Steps to reproduce the problem:

1. Open the document
2. At the bottom of first page there is a input field that is supposed to contain the dynamic date of today, in format DD/MM/YY. Same on a similar field on the second page.

What is the expected behavior? (add screenshot)

Today I expect to see "12/09/23".

What went wrong? (add screenshot)

The field contains "19/12/22" which I suppose is the date when the document has last updated with Acrobat tools.
As the field is not editable, I can't even manually fix the value.

[Snuffleupagus]

(GitHub doesn't allow to upload)

That's actually supported, please note the Attach files by dragging & dropping, selecting or pasting them. at the bottom of all input-fields here at GitHub.

Same document as #16937 (where an issue of XFA vs AcroForm has been diagnosed).

Isn't this issue effectively a duplicate of the other one, since it seems that none of the AcroForm-fields have working scripting and you'd apparently need to use the XFA in order for this to actually work?
Opening the PDF document in PDFium (i.e. the Google Chrome PDF Viewer) it appears to be similarly "broken" there as well.