Uhm...??? Why are we talking about making it associative again? I don't want to make it associative.
How to reproduce (I'm on AutoCAD 2024, if it's fixed in a newer version, please let me know and I'll upgrade):
Make a rectangle (RECT)
Fill it with a Hatch, make sure it's not Associative.
Now start a Stretch command (S), select 2 corners of the rectangle and hatch using the window-crossing (right to left select). Stretch the geometry.
One of two things will happen:
1) The rectangle side will be stretched, the hatch side will stay put. You can then select the Hatch and manualy stretch the Hatch using the Grips.
2) The rectangle side will be stretched, the hatch side will move along (you crossed by the center of the hatch). You can then select the Hatch and manualy stretch the Hatch using the Grips.
That's happens in my AutoCAD, and with the original poster. All we would like is that the grip edges of the hatch are selected and stretched along with the original Stretch command. If this has been fixed in 2025 or 2026, I'll upgrade my Autocad.