Project within production didn't save or auto-save HELP!

Hi all,

It's one of those days I wish Adobe had a hotline for pro users... grrrrr...

So I've been working on a Premiere Productions for a long time. It has several projects and I normally have 5 or six of them simultaneously opened.  Most of them have media files and only one has the assembly cuts, which is where I spend most of my time. About 40 minutes ago I noticed that, out of the blue, the undo command was no longer working. As I had auto-save on and I was able to (apparently) "save all", I pushed through for more 10 minutes till I decided I had enough of it, saved all once again, quit the application and restarted. 

I was able to reopen the Productions and all looked fine WITH THE EXCEPTION that the project with the assemblies simply didn't save AT ALL! None of the work I've done in it for the past 3 hours was saved! Strangely, all the other projects were saved normally.

To make matters worse, that project wasn't autosaved either, while the others were!

Needless to say I'm freaking out... I would love if anyone from Adobe could take a look at this and provide some assistance.

Is there a temporary/cache location where autosave projects are stored? It really makes no sense to me how this could happen...

Sorry for venting and thank you in advance for anyone who might wanna help.

My specs:

MacPro Tahoe 26.1

Adobe Premiere Pro 25.5.0.