Why are sections not numbered, when the parent template `section/subsection in toc` in beamer is set?

Question

I want to have numbered sections in beamer and as far as I understand I should set the section/subsection in toc template, as in my MWE:
documentclass[english]{beamer}

setbeamertemplate{section/subsection in toc}[sections numbered]

begin{document}
    frame{tableofcontents}
    section{Test1}
    frame{Content1}
    section{Test2}
    frame{Content2}
end{document}

However this does not create section numbers, as you can see:

I know that I can get section numbers, if I set setbeamertemplate{section in toc}[sections numbered] but from the documentation, I don't understand why my first attempt does not work?

campa · Accepted Answer

I think that's a bug in the documentation. The correct template is called
sections/subsections in toc

(note the plurals), and if you use
setbeamertemplate{sections/subsections in toc}[sections numbered]

you'll get the numbers as expected.
beamer templates use the primitive csname...endcsname construction; this has the disadvantage (in this case) that if the resulting control sequence if undefined it gets defined as relax. The net effect is that something like
setbeamertemplate{my made up template name}[foo bar baz]

does absolutely nothing.

Why are sections not numbered, when the parent template `section/subsection in toc` in beamer is set?

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