Templates on vertical slides are not working

[stratosgear]

Describe the bug Templates on vertical slides are not working, as slides that are vertical are not inheriting the template

Samples to Reproduce

Given this sample toy template (saved as `templates.slides.def.vertfail'):

<!-- .slide style="background: radial-gradient(#F6F8FA, #808080);" -->

<grid drag="10 10" drop="-1 -1" bg="red">
</grid>

<% content %>

And this slide presentation:

---
title: Slide Presentation
date: 2023/5/2
bg: '#606060'
theme: consult
defaultTemplate: "[[templates.slides.def.vertfail]]"
maxScale: 4
---

Text1

---

Text2

---

Text3

Everything is working fine!!!

But on this presentation:

---
title: Failing Slide Presentation
date: 2023/5/2
bg: '#606060'
theme: consult
defaultTemplate: "[[templates.slides.def.vertfail]]"
maxScale: 4
---

Text1

---

Text2

--

Text3

The last two slides do NOT have the template applied.

Expected behavior I would expect both presentations to work... :(

[stratosgear]

Actually even "forcing" a template on the vertical slides does not seem to help either:

---
title: Slide Presentation
date: 2023/4/26
bg: '#606060'
theme: consult
defaultTemplate: "[[templates.slides.def.vertfail]]"
maxScale: 4
---

Text1

---

<!-- slide template="[[templates.slides.def.vertfail]]" -->

Text2

--

<!-- slide template="[[templates.slides.def.vertfail]]" -->

Text3