Steps to reproduce:
1. Open User's attached project
2. Open scene "Main"
3. Expand "Simple_Grass_Ground" in Assets tab
4. Select "Grass_Ground" (notice: size is 1024x1024)
5. Select "TL_Mud_Cracked_Wet" from Assets tab
6. Select "Grass_Ground" from Assets tab

Expected behavior: size is 1024x1024
Actual result: size is displayed as 0x0

Reproduced with: 5.5.0b2, 5.4.0p4, 5.3.6p2, 5.2.5f1

Note:
-issue does not appear when there is only one sbsar model in Assets folder