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Emails being duplicted

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I'm currently using Thunderbird version 115.9.0. For the last several months when I detach, delete or save an attachment, Thunderbird will duplicate the email. I then manually delete the duplicate.

This didn't happen the first several years I used Thunderbird. Is there some setting I missed? Any solution to prevent this from happening?

Thanks for any advice.

I'm currently using Thunderbird version 115.9.0. For the last several months when I detach, delete or save an attachment, Thunderbird will duplicate the email. I then manually delete the duplicate. This didn't happen the first several years I used Thunderbird. Is there some setting I missed? Any solution to prevent this from happening? Thanks for any advice.