Save as PDF in Ai Automatically Turns the Document I'm Working on Into a pdf

When saving Ai files as PDFs, Ai automatically converts my working document into a pdf — if I don't remember to resave it as an Ai file and just save and close the document, those changes I've been working on only edit the previously saved-out pdf and not the Ai file I was originally working on.
This is extremely frustrating — especially when I've selected the exported PDF to not be editable (to save space)

I've had this issue come up quite a few times in the past and has created unnecessary/major hiccups in my design process.

Is there any way to solve this in settings?