pkg/56283: xelatex cannot find "l3backend-xdvipdfmx.def"

[jmifsud%posteo.net@localhost]

>Number:         56283
>Category:       pkg
>Synopsis:       xelatex cannot find "l3backend-xdvipdfmx.def"
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 29 20:05:00 +0000 2021
>Originator:     Joe Mifsud
>Release:        -current
>Organization:
>Environment:
NetBSD carbon 9.99.85 NetBSD 9.99.85 (GENERIC) #0: Sun Jun 27 23:57:08 UTC 2021  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/i386/compile/GENERIC i386
>Description:
When I call xelatex on a file, I am returned a LaTeX error that 'l3backend-xdvipdfmx.def' cannot be found.  

I input <RETURN> at the error and the process continues (presumeably, it finds another suitable backend?) and then outputs the pdf that I want. 
>How-To-Repeat:
$cat > mwe.tex
\documentclass{article} 
\begin{document}
Hello world!
\end{document}

$ xelatex mwe.tex
This is XeTeX, Version 3.14159265-2.6-0.999992 (Web2C 2020) (preloaded format=xelatex)
 restricted \write18 enabled.
entering extended mode
(./mwe.tex
LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-05-05>
(/usr/pkg/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2020/04/10 v1.4m Standard LaTeX document class
(/usr/pkg/share/texmf-dist/tex/latex/base/size10.clo))

! LaTeX Error: File `l3backend-xdvipdfmx.def' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: def)

Enter file name: 
(./mwe.aux) (/usr/pkg/share/texmf-dist/tex/latex/base/ts1cmr.fd) [1] (./mwe.aux
) )
Output written on mwe.pdf (1 page).
Transcript written on mwe.log.
>Fix:
Don't know!

Maybe something here?
https://github.com/latex3/latex3/commit/089d3b88f93e8fb903b53d445e2605e772f949e1