Autosave does not actually save the file you are working on.
It just maintains a copy of that file in an autosave folder in case the machine is shut down (or crashes) without saving the file.
As soon as you save the file the original PLN is updated and the autosave file is discarded (but will be re-created as soon as you make another modification.
So I am not sure what has happened here.
If you manually 'saved' the file it should be up to date - maybe it is somewhere else on your system?
The autosave file will be gone as you 'saved' the file.
If you had shut down without saving or your machine crashed, then you should be presented with a screen at startup of Archicad to say that there is an autosaved document.
Something like this ...
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11