R Markdown PDF document header no longer working after RStudio 1.3 and R 4 upgrade

I've been using the same YAML header to knit pdf documents for quite a while... and I like it. It's served my purposes well. However, after upgrading to RStudio 1.3 and R 4, it no longer works. I get an error related to LaTeX compilation. I've always relied on R Markdown to handle LaTeX for me, for the most part. Any help anyone can provide here is appreciated. Below is a sample document, which would normally have an image at the top of the first page, but I've just put in a fake image name here (someImage.png). I realize that may cause knitting to fail, but the error I keep running in to occurs prior to R Markdown failing from lack of an image. I can't get past the LaTeX error. The code;

title: This is a Test
author: |
| _____________________________________
| Author N One^1^, Author N Two^2^
| ^1^Affiliation 1
| ^2^Affiliation 2
| _____________________________________
date: |
| _____________
| July 10, 2020
- \usepackage{titling}
- \pretitle{\begin{center}\LARGE\bfseries\includegraphics[width=5.5in]{someImage.png}\\[\bigskipamount]}
- \posttitle{\end{center}}
- \usepackage{caption}
- \pagenumbering{gobble}
- \usepackage{raggedr}
- \usepackage{pdflscape}
- \newcommand{\blandscape}{\begin{landscape}}
- \newcommand{\elandscape}{\end{landscape}}
- \usepackage{float}
fig_caption: yes
number_sections: yes


````{r setup, include=FALSE}`
knitr::opts_chunk$set(echo = FALSE)```

# R Markdown

This is my test pdf.

Produces the error;

! Undefined control sequence.
\->\let \reserved@e
\relax \let \reserved@f \relax @ifstar {\let \reserved...
l.83 ..._____________________}

Error: LaTeX failed to compile testRMD.tex. See The R package tinytex - Helper Functions to Manage TinyTeX, and Compile LaTeX Documents - Yihui Xie | 谢益辉 for debugging tips. See testRMD.log for more info.
Execution halted

It never gave me that error before, just a really nice title page and table of contents. Again, any help here is appreciated.

Also, I'm having a hard to getting the code above to look right in this post. The error is related to the Author and Date parts of the YAML header.

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