Leap 15.2 Build 589.1
upgraded with zypper dup from current Leap 15.1
the upgrade worked without problems
existing user home directory from Leap 15.1

Initially konqueror crashed opening "any" website.

When starting konqueror from the command line this is the crash related output
it produces:

(konqueror:5215): GStreamer-WARNING **: 19:02:55.810: External plugin loader
failed. This most likely means that the plugin loader helper binary was
 not found or could not be run. You might need to set the GST_PLUGIN_SCANNER
environment variable if your setup is unusual. This should normally not
 be required though.
KCrash: Application 'konqueror' crashing...


I found a binary which looked promising to be the desired plugin scanner:
rpm -qf /usr/lib/gstreamer-1.0/gst-plugin-scanner-x86_64
gstreamer-1.16.2-lp152.1.2.x86_64

and set the environment variable as suggested by the error output:

GST_PLUGIN_SCANNER=/usr/lib/gstreamer-1.0/gst-plugin-scanner-x86_64 konqueror

Now konqueror is able to open websites without crashing.

And - after successfully starting konqueror with this setting from the command
line once it also is able to browse websites when started again (no instance
running in the background) from the startmenu or from the command line without
the environment variable, seems like the setting sticks somewhere now.