Actually when it boils right down to it, I can't duplicate your issue on Windows 7 (when Taskbar/Start Menu MRU jumplists were first introduced), or on Windows 10. No matter how many plugins I add to Sigil (or remove/update) via the the plugin manager, I can't get any plugin zip files to show up in the mru jumplist. The list is strictly epubs.
The Windows OS automatically populates that list, and it uses (registry) associated file-types to determine which file-types are appropriate to include for each application. Could it be that your registry file-type associations for Sigil have become damaged? Or maybe manually changed to include .zip mime-types somehow? Or you've not allowed .epub files to be associated with Sigil when installing Sigil?
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