So after publishing a task (right click/Publish from WebUI), one of the models got their id changed to __DELETED__4be00...
The other one (last_model on the screenshot below) is all good and didn't get deleted in this way.
"best_model" exists on the disk and I can access it by taking last_model's URL and just changing the file name, but I cannot normally access it via id (which has now changed to __DELETED__4be00...). Any ideas why this might have happened?