Vumarks do not work on HoloLens 2 in Release Mode

Hello I am upgrading my Hololens 1 app to the HoloLens 2. I am using Vumarks. They work perfectly on Hololens 1 but I can get them to work on HoloLens 2. When i am building my application in Release Mode, i get an error: "cannot load <Marker> database."  In debug Mode it is working. The database is loaded but everything is super low.

I tried different things. Here are some steps to reproduce the problem.

1.  create a new unity project (i am using unity 2019.4)
2.  import hololens 1+2 samples for vuforia
3.  set all required settings for hololens deployment
4.  Build the visual studio solution via the build window of MRTK
5.  compile the app in release mode
6.  check on the hololens 2 that everthing is work.
7.  create a new dev key
8.  create a new vumark (template: https://uni-siegen.sciebo.de/s/Ooj5mHcZSxCws9h )
9.  import new vumark database into project
10.  set new dev key in vuforia configuration
11.  select the new vumark in the scene
12.  build visual solution
13.  compile app in release mode
14.  see error message in the development console on the left bottom
15.  compile app in debug mode
16.  see database is loaded and marker is tracked.

Best,

Florian