Dynamic Commands of Templater doesn't work in frontmatter

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This solution did not work for me.
For me it only worked without the function argument.
ie, this worked for me:

<% tp.file.last_modified_date() %>

This didnt (which is the snipped given in the Templater reference.

<% tp.file.last_modified_date(format: string = "YYYY-MM-DD HH:mm") %>

As said, the proposed solution also didnt work.

Running:
Obsidian v0.14.15
Templater v1.12.0