What software are you using?
Microsoft Office 2019
I've heard about this issue before with MS Office. Maybe try LibreOffice or something.
When I did hidden comments all is ok, default comments are visible in this report All other reports are with hidden comments, only summary has visible
Feel free to send a PR if you have a fix.
Take a backup and try remove comments in cells with red marks. worked for me.
v 4.12 has same problem, fix above
Template Summary has small issue
Comments are visible
then report looks like this
When comments are hidden
All looks OK