To reproduce:
1. Open project attached by the user
2. Make sure that "demo" scene is opened and hit play
3. Select "point_light" in hierarchy and drag it along Z-axis and notice how the lighting is calculated
4. In hierarchy navigate to Map->Grid (1) ->Tilemap and change the orientation from the XZ to XY
5. Repeat 3rd step and notice that the normals are the same as previous orientation

Expected: After changing tilemap orientation normals are updated.
Actual: Normals remain same.

Reproduced with: 2017.2.0b1, 2017.2.0b3
Wasn't able to test with older versions since Tilemap is 2017.2 feature.

Fixed in 2017.2.0b7