@Lemmi - thanks for getting back to us.
That the problem ONLY occurs when the KePub Metadata Writer plugin - which is the only Optional PI of that type - is used could mean that a common change has been made to the built-in Metadata Writer PI's that needs to be reflected in the KePub metadata writer PI. I'll ask someone who may know to take a look at it.
For now I'll leave this thread here.
BR
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