`awful.widget.launcher` has weird error when SVG string passed into `image`

Output of awesome --version:

$ nix run .\#awesome -- --version
warning: Git tree '/home/nmelzer/Projects/nixos-config' is dirty
awesome 4.3 (Too long)
 • Compiled against Lua 5.2.4 (running with Lua 5.2)
 • API level: 4
 • D-Bus support: yes
 • xcb-errors support: no
 • execinfo support: yes
 • xcb-randr version: 1.6
 • LGI version: [string "return require('lgi.version')"]:1: module 'lgi.version' not found:
        no field package.preload['lgi.version']
        no file './share/lua/5.2/lgi/version.lua'
        no file './lgi/version.lua'
        no file './lgi/version/init.lua'
        no file './lib/lua/5.2/lgi/version.so'
        no file './lgi/version.so'
        no file './lib/lua/5.2/loadall.so'
        no file './lib/lua/5.2/lgi.so'
        no file './lgi.so'
        no file './lib/lua/5.2/loadall.so'
 • Transparency enabled: yes
 • Custom search paths: yes

Build from:

awesome: (git repository)
    repository: https://github.com/awesomewm/awesome.git
    branch: master
    revision: 0e5fc4575ab0adbae75908cb49937d9cf63437ec
    url: https://github.com/awesomewm/awesome/archive/0e5fc4575ab0adbae75908cb49937d9cf63437ec.tar.gz
    hash: 0zkqn5ni4iqwfxyilcnp78l0xan7ksvk1q71wqh1i2fh5hmxhn34

How to reproduce the issue:

In the default config, replace the mylauncher definition with the following:

local mylauncher = awful.widget.launcher({
    image =
    [[<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32"><path fill="#7ebae4" fill-rule="evenodd" d="M13 11.115L6.183 23.76L4.59 20.87l1.839-3.387l-3.651-.01L2 16.029l.8-1.477l5.2.018l1.868-3.447Zm.527 10.108h13.64l-1.541 2.922l-3.658-.011l1.817 3.389l-.779 1.449h-1.593l-2.584-4.825l-3.722-.008Zm7.94-5.541l-6.82-12.645l3.134-.032L19.6 6.4l1.834-3.379h1.557l.795 1.479l-2.612 4.807l1.854 3.455Z"/><path fill="#5277c3" fill-rule="evenodd" d="m10.542 16.324l6.821 12.645l-3.134.031l-1.821-3.4l-1.834 3.38H9.016l-.8-1.476l2.615-4.804l-1.855-3.457Zm7.922-5.573H4.823l1.542-2.922l3.658.011l-1.816-3.389L8.986 3h1.592l2.584 4.825l3.722.008ZM19 20.888l6.817-12.644l1.593 2.89l-1.839 3.386l3.651.01l.778 1.449l-.8 1.477l-5.2-.018l-1.868 3.447Z"/></svg>]],
    menu = mymainmenu
})

Actual result:

I got an error like this:

2023-08-09 20:10:06 E: awesome: Failed to load '<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32"><path fill="#7ebae4" fill-rule="evenodd" d="M13 11.115L6.183 23.76L4.59 20.87l1.839-3.387l-3.651-.01L2 16.029l.8-1.477l5.2.018l1.868-3.447Zm.527 10.108h13.64l-1.541 2.922l-3.658-.011l1.817 3.389l-.779 1.449h-1.593l-2.584-4.825l-3.722-.008Zm7.94-5.541l-6.82-12.645l3.134-.032L19.6 6.4l1.834-3.379h1.557l.795 1.479l-2.612 4.807l1.854 3.455Z"/><path fill="#5277c3" fill-rule="evenodd" d="m10.542 16.324l6.821 12.645l-3.134.031l-1.821-3.4l-1.834 3.38H9.016l-.8-1.476l2.615-4.804l-1.855-3.457Zm7.922-5.573H4.823l1.542-2.922l3.658.011l-1.816-3.389L8.986 3h1.592l2.584 4.825l3.722.008ZM19 20.888l6.817-12.644l1.593 2.89l-1.839 3.386l3.651.01l.778 1.449l-.8 1.477l-5.2-.018l-1.868 3.447Z"/></svg>': Failed to open file “<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32"><path fill="#7ebae4" fill-rule="evenodd" d="M13 11.115L6.183 23.76L4.59 20.87l1.839-3.387l-3.651-.01L2 16.029l.8-1.477l5.2.018l1.868-3.447Zm.527 10.108h13.64l-1.541 2.922l-3.658-.011l1.817 3.389l-.779 1.449h-1.593l-2.584-4.825l-3.722-.008Zm7.94-5.541l-6.82-12.645l3.134-.032L19.6 6.4l1.834-3.379h1.557l.795 1.479l-2.612 4.807l1.854 3.455Z"/><path fill="#5277c3" fill-rule="evenodd" d="m10.542 16.324l6.821 12.645l-3.134.031l-1.821-3.4l-1.834 3.38H9.016l-.8-1.476l2.615-4.804l-1.855-3.457Zm7.922-5.573H4.823l1.542-2.922l3.658.011l-1.816-3.389L8.986 3h1.592l2.584 4.825l3.722.008ZM19 20.888l6.817-12.644l1.593 2.89l-1.839 3.386l3.651.01l.778 1.449l-.8 1.477l-5.2-.018l-1.868 3.447Z"/></svg>”: No such file or directory
stack traceback:
        ...08cb49937d9cf63437ec/share/awesome/lib/gears/surface.lua:103: in function <...08cb49937d9cf63437ec/share/awesome/lib/gears/surface.lua:95>
        (...tail calls...)
        ...937d9cf63437ec/share/awesome/lib/awful/widget/button.lua:54: in function 'set_image'
        ...937d9cf63437ec/share/awesome/lib/awful/widget/button.lua:61: in function <...937d9cf63437ec/share/awesome/lib/awful/widget/button.lua:42>
        (...tail calls...)
        ...7d9cf63437ec/share/awesome/lib/awful/widget/launcher.lua:72: in function <...7d9cf63437ec/share/awesome/lib/awful/widget/launcher.lua:70>
        (...tail calls...)
        /nix/store/99i2bz5h83aq29d8k99dkhmpvz22iv2p-awesomerc.lua:70: in main chunk
2023-08-09 20:10:07 W: awesome: a_glib_poll:477: Last main loop iteration took 0.167526 seconds! Increasing limit for this warning to that value.
2023-08-09 20:10:11 E: awesome: a_xcb_io_cb:441: X server connection broke (error 1)

Expected result:

Two variants:

1. Display the error also as a notification, not in the terminal
2. No error message displayed and a nice SVG icon is used for the menu widget.

Preferably 2, as that would reflect what is currently documented: https://awesomewm.org/apidoc/widgets/awful.widget.launcher.html#image