EXCEL - Nested JQLIssuesCount aren't resolving correct mappings

As detected with the word engine, the excel engine is having some misbehaviour when populating nested JQLIssuesCount iterations.
I'm attaching two docx and two equivalent xlsx templates and their outputs.
The results from docx documents are correctly populated while the xlsx aren't.

DOCX template	DOCX output	XLSX template	XLSX output
JQLIssuesCountBugs4.1.docx	JQLIssuesCountBugs4.1_generated.docx	JQLIssuesCountBugs4.1.xlsx	JQLIssuesCountBugs4.1_generated.xlsx
JQLIssuesCountBugs5.docx	JQLIssuesCountBugs5_generated.docx	JQLIssuesCountBugs5.xlsx	JQLIssuesCountBugs5_generated.xlsx