message about "This document contains macros."

users
#1

Today i added a worksheet to a libreoffice-calc document.

After saving/re-opening this document i get the message as in the subject of this mail.

Why?

i do not see any macro's, when looking under:

Tools/Macros/Edit/<docname>

And also , there are no macros in this document, and have never been there, in this document ....

This is in LibreOffice 6.2.0.3 (x86) (Windows 10)

Should i file a bug?