gfm or commonmark support not as good as markdown

When using --from gfm or --from commonmark I have this old l.330 \frontmatter issue (see #5348) but not when using --from markdown.

pandoc shodan-api.mkd \
--from gfm \
--to pdf \
-o test.pdf \
--pdf-engine=pdflatex \
--table-of-contents \
--toc-depth 6 \
--number-sections \
--highlight-style breezedark \
--top-level-division=chapter \
--template eisvogel
Error producing PDF.
! Undefined control sequence.
l.330 \frontmatter

The error also happens when removing book: true.

MD file:

---
title: "Example PDF"
author: [Author]
date: "2017-02-20"
subject: "Markdown"
keywords: [Markdown, Example]
lang: "en"
book: true
...

# Vinaque sanguine metuenti cuiquam Alcyone fixus

## Aesculeae domus vincemur et Veneris adsuetus lapsum

Lorem markdownum Letoia, et alios: figurae flectentem annis aliquid Peneosque ab
esse, obstat gravitate. Obscura atque coniuge, per de coniunx, sibi **medias
commentaque virgine** anima tamen comitemque petis, sed. In Amphion vestros
hamos ire arceor mandere spicula, in licet aliquando.

```java
public class Example implements LoremIpsum {
    public static void main(String[] args) {
        if(args.length < 2) {
            System.out.println("Lorem ipsum dolor sit amet");
        }
    } // Obscura atque coniuge, per de coniunx
}
```

Porrigitur et Pallas nuper longusque cratere habuisse sepulcro pectore fertur.
Laudat ille auditi; vertitur iura tum nepotis causa; motus. Diva virtus! Acrota
destruitis vos iubet quo et classis excessere Scyrumve spiro subitusque mente
Pirithoi abstulit, lapides.

## Lydia caelo recenti haerebat lacerum ratae at

Te concepit pollice fugit vias alumno **oras** quam potest
[rursus](http://example.com#rursus) optat. Non evadere orbem equorum, spatiis,
vel pede inter si.

1. De neque iura aquis
2. Frangitur gaudia mihi eo umor terrae quos
3. Recens diffudit ille tantum

\begin{equation}\label{eq:neighbor-propability}
    p_{ij}(t) = \frac{\ell_j(t) - \ell_i(t)}{\sum_{k \in N_i(t)}^{} \ell_k(t) - \ell_i(t)}
\end{equation}

Tamen condeturque saxa Pallorque num et ferarum promittis inveni lilia iuvencae
adessent arbor. Florente perque at condeturque saxa et ferarum promittis tendebat. Armos nisi obortas refugit me.

> Et nepotes poterat, se qui. Euntem ego pater desuetaque aethera Maeandri, et
[Dardanio geminaque](http://example.com#Dardanio_geminaque) cernit. Lassaque poenas
nec, manifesta $\pi r^2$ mirantia captivarum prohibebant scelerato gradus unusque
dura.

- Permulcens flebile simul
- Iura tum nepotis causa motus diva virtus Acrota. Tamen condeturque saxa Pallorque num et ferarum promittis inveni lilia iuvencae adessent arbor. Florente perque at ire arcum.

$ pandoc --version
pandoc 2.8
Compiled with pandoc-types 1.20, texmath 0.12, skylighting 0.8.3

https://github.com/jgm/pandoc/issues/6103

Wandmalfarbe / pandoc-latex-template

gfm or commonmark support not as good as markdown #150