When using the mapping ${Key} in a Word's template header, if we use a JQL clause to filter by issuekey, only one element of the iteration is exported

When using the mapping ${Key} in a Word's template header, if we use a JQL clause to filter by issuekey, only one element of the iteration is exported.

Steps to reproduce:

Use the following template: debug_clause1.docx

Workaround:

Remove the ${Key} mapping from the header or add the ${JQLIssues[i].Key} mapping inside the iteration. The following template works correctly: debug_clause2.docx