Is it that hard to add a "don't show me this anymore"

Awful UX, is because of things like this that people end leaving for Sketch or other tools. Adobe, you are a huge company, SOLVE IT, it's been more than a year already.

Not fixed ... appearing every time I save.

MacOS Mojave version 10.14.5
CC 2020 illustrator version 24.0.3

Have this problem.
Illustrator 24.0.1
MacOS 10.14.6
I also save my files to Google Drive File Stream; 36.0.18.0

I understand that you think you fixed this in 24.0.2, so I should update.
But based on a comment below that mentions the issue persisting even after they updated, and them also using Google Drive File Stream, I'm wondering if that's the issue.

Once I save a file in Illustrator (FILE>SAVE) and try to close the file the message pops up "If you don't save, your changes will be lost." And the option to save again comes up. What's going on?
See attached screenshot.
Using version 24.0.3

I get this error. Illustrator 24.0.3
MacOS 10.15.3 (19D76)
Saving files to Google Drive File Stream v36.0

Still getting this error in 24.0.3. Really would like it to stop.

This file has been modified outside illustrator. do you want to continue
Didn't had it for long but reappear recently almost every-time I wanted to save my files:
MacOS Mojave version 10.14.6
CC 2020 illustrator version 24.0.3

Still an issue on 24.0.3. It's almost become a part of my workflow, that extra click. Please fix this!

I'm still getting this in 24.0.3.
Exasperating.
C'mon Adobe get it together!!

Not fixed @ashutosh

Not fixed

Same issue, 24.0.3 running on Mac OS 10.14.6 Mojave

I'm having the exact same issue on a regular basis since updating to 24.0.02 on mac.

I just recently updated to 24.0.02 on a PC and I received this pop-up.

when i save my file (cc2020) to cs5 so that my friend can open it, 1 of my artboard suddenly become a image, not a vector, like it has been resterized. can you help me?

I have the same problem. When will this issue be fixed??? Every time I save, I get that popup. Using Illustrator 24.0.1 and there's no CC says I'm up to date.

It happens to me once my newly created document is backed up to the "cloud." Once it is backed up the warning message appears, each and every time.

When will this issue be fixed??? Every time I save, I get that popup. Using Illustrator 24.0.1 and there's no CC says I'm up to date.

I keep getting "this file was modified outside Illustrator" when it clearly was not.

Also, Illustrator app quits after saving an Illustrator file. Almost every time.

I have to keep re-opening Illustrator 24.0.2.

I have Illustrator 24.0.1 running on MacOS Majave (v10.14.6) and I also have this very annoying issue. Looking forward to it getting resolved, thank you!!