Qt Assistant and content sorted before 5.11

[Nelson numerical software]

Hi,

I use Qt Assistant as help viewer for my tools
https://nelson-numerical-software.github.io/nelson-website/HELPVIEWER.html

Previously content displayed in Qt Assitant was not sorted.
order was fixed by load order.
Since 5.11 and current 5.12, content is sorted by alphabetical order

How to disable this sort ?
I was a great feature ...

Thanks