[kde] [Bug 358909] New: Many icons missing (seeing placeholder) or even invisible

[Bert via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=358909

            Bug ID: 358909
           Summary: Many icons missing (seeing placeholder) or even
                    invisible
           Product: kde
           Version: unspecified
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: Bert.Bril at gmail.com

I have customized my desktop and panel by using 'show a launcher when not
running'and also by using my own .desktop files. Yesterday I changed some
settings to get inkscape tooltips to be readable. After some experiments I got
this working, and I can now (still) see the tooltips.

Unfortunately when I started my computer this morning, I saw many icons no
longer had their own icon showing but a placeholder (an icon of something like
an empty document). This was in the KDE launcher, but also the panel. Not for
all icons.
Showing: konsole, ksnapshot, Chrome, Dolphin, system settings
Placeholder: Synaptic, Skype, Thunderbird, scudcloud
Totally invisible, but present and working: My own .desktop icons in the panel

The latter is very very strange as the full absolute path is in the .desktop
file! I can display the .svg file with inkscape.

Reproducible: Always

Steps to Reproduce:
1. KDE/Plasma 5 starts
2. Some of the icons are totally missing, some have a placeholder icon, some
are OK.
3. Change many themes, settings, whatever ...
4. Restart KDE or reboot
5. Still bad stuff

Actual Results:  
Some of the the icons are bad or missing, but clicking them always works.

Expected Results:  
I would like to get my icons back. I mean I *know* there are a couple of
invisible icons on my panel, and I can use them, they do show tooltips too.
Also, I can look at the tooltips to see which icon is which in the panel, and
read the menu texts.

I have googled a lot now, and got tips ranging from setting everything to
'oxygen' to deleting all caches including the icon cache. I really tried every
theme, look&feel, GTK2/3 setting, colors, .... nothing works.

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