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This explanation doesn't fit the behavior.  If the attach_count were incorrect to begin with (when Convert Image saved the thread), the thread attachments would be displayed incorrectly immediately, which is not the case.  The thread attachments are displayed correctly until the thread is edited and an attachment is deleted.  When this occurs in XF2.0, I can revert the change and the images display correctly, which I can subsequently verify the attachment_count is correct, yet despite this fact, disabling all add-ons, and re-edited the thread will cause attachment_count to revert to 0 100% of the time (once the issue has occurred and is reverted).  So, there is something about the specific thread (e.g. content) that seems to be is causing this.  When this happens, is there something I can do to debug this further?