Underscore Problem

In some mathjaxr equations, the underscore symbol is converted into \emph when using devtools::document() to create the 'Rd' files from roxygen2::roxygenize.

This repository gives two examples of the problem: A, and B

Workflow:

1. Sys.setenv(MATHJAXR_USECDN=TRUE)
2. devtools::document()
3. ?Anotworking
4. ?Aworking
5. ?Bnotworking
6. ?Bworking

Problem A: underscore as subscript

Equation in the file Anotworking.R:
\hat{p}_c = \frac{1}{N} \sum_{i=1}^N B_{i,c}

How the equation is converted in Anotworking.Rd:
\hat{p}\emph{c = \frac{1}{N} \sum}{i=1}^N B_{i,c}

The problem seems to be with {p}.

Equation in the file Aworking.R are converted correctly:
p_{c} = \frac{1}{N} \sum_{i=1}^N B_{i,c}

Problem B: underscore as text

Equation in the file Bnotworking.R:
w\_outlier_{i,c}B_{i,c}=1-\frac{d_{i,c}}{\lbrace {d_{j,c}} \rbrace}\lbrace {d_{j,c}}\rbrace

How the equation is converted in Bnotworking.Rd:
w\\emph{outlier}{i,c}B_{i,c}=1-\frac{d_{i,c}}{\lbrace {d_{j,c}} \rbrace}\lbrace {d_{j,c}}\rbrace

Similarly to before, the problem is at the start. When the underscore is replaced with a space, the equation in Bworking.R is converted correctly:
w\text{ }outlier_{i,c}B_{i,c}=1-\frac{d_{i,c}}{\lbrace {d_{j,c}

Session Information

R version 4.0.2 (2020-06-22)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.

loaded via a namespace (and not attached):
Rcpp_1.0.5
mathjaxr_1.4-0
compiler_4.0.2
prettyunits_1.1.1
remotes_2.2.0
tools_4.0.2
testthat_2.3.2
digest_0.6.25
packrat_0.5.0
pkgbuild_1.1.0
pkgload_1.1.0
memoise_1.1.0
lifecycle_0.2.0
rlang_0.4.10
cli_2.0.2
rstudioapi_0.11
commonmark_1.7
xfun_0.20
withr_2.4.1
stringr_1.4.0
roxygen2_7.1.1
knitr_1.28
xml2_1.3.2
desc_1.2.0
fs_1.4.2
devtools_2.3.2
rprojroot_1.3-2
glue_1.4.1
R6_2.4.1
processx_3.4.4
fansi_0.4.1
sessioninfo_1.1.1
callr_3.5.1
purrr_0.3.4
magrittr_1.5
backports_1.1.8
ps_1.3.3
ellipsis_0.3.1
usethis_2.0.1
assertthat_0.2.1
tinytex_0.23
stringi_1.4.6
crayon_1.3.4