SUMMARY
Regression
Since 5.20 a symbol on my desktop can not open files anymore and I get error messages, opening programs works as before.

STEPS TO REPRODUCE
1. always after having upgraded to 5.20.0
2. 
3. 

OBSERVED RESULT 
Klicking on a symbol, which should open a file on my pc, it tries to open a program. If choosing "accept", I get always the comment, that the *.desktop file in /home/*/.local/share/plasma_icons/*.desktop is invalid. But this is not true. Opening this desktop file direct in /home/*/.local/share/plasma_icons/*.desktop works.
The properties of that symbol contains the right url.
The desktop file contains "Type=Link", this may cause the problems. If "type" is "application" it works normal.

EXPECTED RESULT
symbol should open the file mentioned in the url

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: openSUSE TW current
(available in About System)
KDE Plasma Version: 5.20.0
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1

ADDITIONAL INFORMATION
5.20.0 has more issues with openSUSE TW