Thumbnails for child blueprint are not updated after changing a component in child blueprint

Thumbnails for child blueprint are not updated after changing a component in child blueprint

1. Create blueprint A with component static mesh X
2. Set X as any static mesh
3. Create blueprint B as A’s child
4. Change X in B to another static mesh

RESULT:
Thumbnail for B in content browser won’t change after changing static mesh, the same happens for components like skeletal mesh and probably the others that can change thumbnail icon