=headN and =begin headN is generated differently

Hello,

reading the docs, and the way I understand it https://docs.raku.org/language/pod#Abbreviated_blocks, `=head2 FOO` is really the same as
```pod6
=begin head2
FOO
=end head2
```
yet the generated code is different.

I don't know if this is a bug but could you please enlighten me about the reason it's different?
Thank you.