Icon 'image-missing' not present

GIMP version: 2.99.1

Operating System: Kubuntu 18.04

Package: [flatpak? Installer from gimp.org? If another installer, tell us where from] deb http://ppa.launchpad.net/otto-kesselgulasch/gimp-edge/ubuntu/ bionic main

Description of the bug

If I would open file, I go to file manager and chose some folder (Documents for example). I will got next:

Missing fast-path babl conversion detected, Implementing missing babl fast paths
accelerates GEGL, GIMP and other software using babl, warnings are printed on
first occurance of formats used where a conversion has to be synthesized
programmatically by babl based on format description

*WARNING* missing babl fast path(s): "Y u16" to "Y' u8"
*WARNING* missing babl fast path(s): "R'G'B' double" to "CIE Lab double"
This is a development version of GIMP.  Debug messages may appear here.

babl is using a rather long chain, room exists for optimization here
/usr/lib/x86_64-linux-gnu/babl-0.1/CIE.so 0: CIE LCH(ab) double to RGBA double : 0,000000000000
/usr/lib/x86_64-linux-gnu/babl-0.1/gggl-lies.so 0: RGBA double to RGBA float : 0,000000000000
/usr/lib/x86_64-linux-gnu/babl-0.1/float.so 0: RGBA float to R'G'B'A float : 0,000000000000
/usr/lib/x86_64-linux-gnu/babl-0.1/gggl.so 0: R'G'B'A float to R'G'B' float : 0,000000178527
/usr/lib/x86_64-linux-gnu/babl-0.1/simple.so 0: R'G'B' float to R'G'B' u8 : 0,000000000000
set device 'Virtual core XTEST pointer' to mode: disabled
set device 'ELAN0501:00 04F3:3010 Touchpad' to mode: disabled
*WARNING* missing babl fast path(s): "cairo-ARGB32" to "R'G'B'A u8"
**
Gtk:ERROR:../../../../gtk/gtkiconhelper.c:494:ensure_surface_for_gicon: assertion failed (error == NULL): Icon 'image-missing' not present in theme Symbolic (gtk-icon-theme-error-quark, 0)
gimp: fatal error: Aborted
27      ../sysdeps/unix/sysv/linux/read.c: No such file or directory.
gimp (pid:15408): [E]xit, show [S]tack trace or [P]roceed: E

(script-fu:15423): LibGimpBase-WARNING **: 23:28:47.679: script-fu: gimp_wire_read(): error

Reproduction

Is the bug reproducible? Always

Reproduction steps:

Described in description part …

Expected result:

Actual result:

Additional information

Previous versions 2.10.x works fine.