Unable to save in Xojo 2019r2

I can make a BRAND NEW project, command-option drag the external classes to my project window, make a couple changes to the externalitems, save twice, and it errors 100% of the time.

  1. Make a new project called “Test 1”

  2. Make a new Class1

  3. Add method new class and call it “Josh” and add some code to it. File->Save.

  4. Right-click Class1and choose Make External. File->Save.

  5. Edit the contents of method “Josh” a few times, saving in between each keystroke and watch the project save successfully each time.

  6. Make a new project and call it “Test 2.”

  7. Command-option drag from the Dekstop Class1.xojo_binary_code into “Test 2.”

  8. Open Josh method of Class1 and make some change. File->Save. No problems.

  9. Make more changes. File->Save. ERROR!

same in 2019r2.1
second save in Test2 gives an error

Cool. Obviously, nobody else develops this way or nobody develops at all on Catalina. I got a variation of the problem. After I save the second test project I can’t edit class1 anymore.

I usually copy-and-paste my external code between projects. Doing that doesn’t trigger the bug.