Problem printing solid hatches with transparency

[prx14.engineering]

From the autocad 2019 version and later, when printing solid hatches with transparency, each hatch with transparency prints it as if it were an image (you can check by enlarging the pdf that is pixelated)
The problem with each transparent shading coming out as an image is that the PDF file is very heavy, and the PDF takes time to load, it is very difficult to scroll through it.
Could you tell me why this happens and if I can solve it with some parameter or option of the plotter?

In version 2015 this problem does not exist, shading with transparency works perfectly

Attached image where you can see the problem perfectly

I put a dwg file and 2 PDFs

One printed with autocad 2015 - the PDF file weighs 490kb

The same PDF printed with autocad 2021 weighs 18.206kb

Thanks!

[prx14.engineering]

attached defining image

[pendean]

>>>..when printing solid hatches with transparency...<<<
>>>...each hatch with transparency prints it as if it were an image...<<<
That is how AutoCAD does it with that combination.

Why you need hatch transparence in a 23"x33" print of very very tiny shapes with colors in them Is what I wonder is the benefit from, at that print scale there is no appreciation to the transparency at all unless you zoom extremely into the PDF.

 

[prx14.engineering]

This is an example showing the problem. Autocad 2015 prints it vectorly. Autocad 2021 prints each hatch individually as a small image and with it the size of the PDF file. I work daily with hatch and transparency factor and I need autocad 2021 to work like autocad 2015. There must be a hidden parameter for this that I do not know