I just changed my whole workflow from Vectary to Blender now
I have serious issues in camera animation and I think this is Babylon.js glTF importer related:
camera is mirrored
several faces are missing in scene (e.g. the floor at the end)
Also camera FOV is not animated but that is not supported by glTF exporter anyway - I will do this in Babylon.js.
I guess these two problems are connected with glTF import in Babylon.js because I tried another glTF viewer and there it was correct.
Screenshot in Blender: