"Update" is unticked for translation memory when a project

I have studio 2019. 

When I create a new project, I'll add one or two memories and ensure that "update" is ticked. Then I'll open the document(s) I want to work on. When I go back to settings, "update" is unticked.

At first I thought I was forgetting to tick the box, but today I very carefully ticked the box, finished creating the project, opened the document, checked the settings, and lo and behold, box no longer ticked.

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