This plugin was created before the Preserve Entities preference setting was added to Sigil. You should be able to add the hairsp entity (or any other invisible character entity) to your preserve entities list and Sigil will convert any characters found when saving or manually Mending/Prettifying. If not, then the hairspace entity may be being converted into some other character (for unknown reasons.
I'll take a look at why the plugin may be acting up on the hairspace char, though. Have you verified the plugin still even works with any of the invisible characters? Sigil's gone through many changes since its time.
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