pkg/57221: netsurf "hamburger" menu button seems missing

[brandon%burn.net@localhost]

>Number:         57221
>Category:       pkg
>Synopsis:       netsurf "hamburger" menu button seems missing
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 08 00:30:00 +0000 2023
>Originator:     Brandon Applegate
>Release:        9.3
>Organization:
>Environment:
NetBSD localhost 9.3 NetBSD 9.3 (GENERIC) #0: Thu Aug  4 15:30:37 UTC 2022  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
Using the binary package (3.10nb6 on amd64, 3.10nb4 on sparc) - the right hand main button for netsurf shows a broken icon.  Screenshots for the gtk3 version on the Netsurf site show a "hamburger" (multiple horizontal lines) button.

I've tried this on my sparc machine, as well as an amd64 virtual machine.  Both exhibit this problem.  I *believe* this icon is compiled in.  I ran -v and captured the log - and there doesn't seems to be any errors with not finding a pixmap / icon etc.
>How-To-Repeat:
Start netsurf-gtk3, observe the main file button on the far right,
>Fix: