It's a PITA really, but as @mrmikel says, it's only been occasional for me - say once in every 20-30 edits. However, other than intellectual curiosity (which I do have from time to time!) it isn't worth (to me) the time spent tracking down the values of the few offending glyphs - usually they are something relatively easily spotted and easily replaced (or deleted) during the visual checking process. If I miss one or two it's not serious, as most of this editing is done for my own benefit.
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