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Terrible Desktop Bug: “Save As” with “Replace” doesn't actually replace. Keeps the old file and loses the new work.

I'm on mac, using Scratch Desktop. Built a project, used menu “File:Save to your computer” to save it.
Continued editing for a while. Again used menu “File:Save to Your Computer” with the same project name, and the file dialog box says, “test-save-as.sb3” already exists. Do you want to replace it?” and I press “Replace”. Putting the revised project onto disk, right? No it didn't.

Then quit scratch 3 Desktop. Look at the file from the outside–UH-OH: the file has the first save time, as if it didn't get the new work?
Let's check: open scratch 3 desktop, use menu “File:Load from your computer”… Oh no, it's the old original version, all my new work is gone!

I've tried this 3 times now, and every time scratch 3.6.0 desktop fails to replace older files with new versions. During my tests I also save with new names (“test-save-as2.sb3”) and those save, as long as you don't try to save onto an existing file name.

Can you try updating to 3.10.2?
https://scratch.mit.edu/download

This happens to me to! As apple502j said though it may have already been fixed. You should try the newer version.

Scratch Desktop 3.10.2 seems to work for save with replace in my few quick tests, hurrah!

Thank you! And thank you for responding so quickly.

Your suggestions prompted me to visit https://scratch.mit.edu/download. My choice there is to either download from the apple app store or download direct. It turns out that the apple app store still thinks 3.6.0 is the latest edition as of today (27 May 2020). (I had been checking there for updates which never came.) The download direct from https://scratch.mit.edu/download gets me a newer Scratch Desktop 3.10.2.