I guess this is a bug, when i change the Import Uniform Scale, re-import a character mesh, the mesh size does not change in corresponding Character Blueprints.
This might be related to the following scenario.
Imported Mesh and Animations with uniform transformation 1. Changing Mesh transformation, without additionally changing (reimporting related animations with the same transformation). In-game animations are generally automatically resized to fit the mesh.
Sorry, but i already changed/reimported all meshes and animations in a lower scale, instead of just resizing the character mesh, to fit the scale. If i come across this issue again (likely), i will post a video. Thanks.