Missing icons in menu

[Red-Eyed]

I have missing icons in menu
On Manjaro Gnome, I have theme Matcha-sea, icons: Papirus-Adapta-Maia

~ flatpak run org.kde.okular 
Gtk-Message: 01:00:33.035: Failed to load module "canberra-gtk-module"
Gtk-Message: 01:00:33.035: Failed to load module "canberra-gtk-module"
Qt: Session management error: None of the authentication protocols specified are supported
Icon theme "gnome" not found.
Icon theme "gnome" not found.
Icon theme "gnome" not found.
Icon theme "gnome" not found.
Icon theme "gnome" not found.
Icon theme "gnome" not found.

[Nokia808]

Hi. I tested this issue on my device with Okular 1.10 & it is not existing. Also, it was not existing on version 1.19.3 & 1.19.2

See the attached screenshot bellow:

I'm on Fedora 30 X64 bit Cinnamon edition.

[Red-Eyed]

@Nokia808 ,

1. You said: "It's not existing". What is not existing, icon or issue?
2. You posted screenshot with all the icons, claiming that it works. Why did you post this, as the issue occurs on the Manjaro Gnome, not Fedora Cinnamon ?

[Nokia808]

@Red-Eyed
Hi dear friend. Please do not be anger! I was aimed merely to help, not to injure any one.
Here, in Linux community, one of us trying to support other ......

To explain: in my knowledge - please correct to me if I'm wrong - flatpak package should be independent from type of Linux distro, so that no matter if distro is Manjaro or Fedora or Debian .... This was all my drive when I post my comment no more. However, if you saw my edit in my previous comment, just when saw you are on Manjaro I delete a statement "this issue should be closed" ....

[Red-Eyed]

@Nokia808 ,
dear friend, I'm sorry, didn't want to seem angry. Maybe it's my personal manner of communication.
I've asked question really because I want to know answers on them.

Also, I've found that the problem is in icon themes. Once I switched icons to Adwaita and back to my default - icons appeared back.

So, maybe if there is not icons of current theme in the host system, application should use some sort of defaults?