I've tried to reproduce the issue you described, but to no avail. I've tested the scenario with ReadOnlyRanges
instead of "FormulaRanges". It will be great if you can isolate the issue in a sample demo project and send it to us. In this way we can be much more effective in our try to find what causes the issue. It will be also of our great help if you share with us what is the exception, are there any specific circumstances when it occurs as you mentioned the exception is thrown in "some scenarios". Which are these scenarios and can you provide steps to reproduce?
I'm looking forward to your reply.
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