Hello! I am experiencing the same issue today March 23 2024. It has been going on for actually about 6 months. Texture compressing does not work either, nor does the option in UEFN “resize texture import data”.
If you delete the high ticket items and publish, say an asset listed with 100mb showing in the cooked assets in the project size packaged details window are deleted, the project size will still say 399/400mb 99% even after deleting from the content browser and project. I cannot lower my project size and it is inaccurate.
For Example if an asset in the project size details panel shows 7Mb for a Tree_2, I delete all of the Tree_2 assets in the viewport, outliner, and content browser, and foliage,
I push changes to the launcher, and still would show Cooked 399/400MB download size 99% project size.
The game is finished except for fixing these bugs and hopefully other creators can read this post and know they are not alone! 