Well, it’s working great for me. I would propose it’s time for a split-half search to eliminate some variables. Please create a brand new macOS XCode project using my podfile from above (changing the project name)
Then copy and paste my Thing object from above and then the code (func writeABunchOfThings) in the new project. I would add a button to run the code itself.
Run the project.
If it works and behaves correctly, something in your original project is causing the issue
If it does not work, then you’ve got an environment issue; maybe a config issue or some other issue - possibly event corrupted files or a hardware problem.
I have followed those steps on three different Macs; a 2019 iMac, 2017 iMac and a 2013 Macbook Pro 15". The results are roughly the same.