Large cache not restored

Hello!

I'm having issues with restoring a cache of approximately 2GB, created by the same branch on a pull request.
At the first run I'm able to create correctly the cache (according to the output of the action):

https://github.com/dariosortino/testci_multicore/actions/runs/4697852048/jobs/8329413441

After a push on the same branch (consequently having a re-run of the workflow), the cache can't be restored:

https://github.com/dariosortino/testci_multicore/actions/runs/4697956348/jobs/8329643936

And I can't even save again the cache since it's already there:

Since the cache is created by the branch itself, it should not be a visibility issue.

In fact, I also made some trials by caching a small test file, and everything works as expected (I can restore it correctly).
That's why I'm suspecting that it's a size issue at this point.

cc @RiccardoGrieco

Start by comparing the cache logs in the two linked GitHub Actions workflow runs, then reproduce the behavior with the approximately 2GB cache and the small test file. Done means a cache created on a branch can be restored on a later run, without a failed restore or an inability to save because the cache already exists.