The plugin has been updated for EPUBCheck 5.1.0. Those who downgraded to EPUBCheck 5.0.1 can do the following to have the plugin download and install EPUBCheck 5.1.0:
Select Preferences > Miscellaneous > Open Calibre configuration folder > plugins
Then either delete the EPUBCheck folder or edit EpubCheck.json and change the last_time_checked entry.
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