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I was able to reproduce this and fix the bug for 414, which should be out on Oct 14th. There should also be some better maintenance tools to fix files' presented tags in these cases. The bug was when you remove two sibling tags that both point to the same thing at once (i.e. in one dialog apply). A quick fix for now is to go back in and add/remove one of those sibling tags to reset the calculation. Thanks again for the report, and I am sorry for the trouble. Let me know if you run into anything else.