How to reproduce:
1. Open the attached project "case1276377.zip"
2. Open Memory Profiler window
3. Open snapshots called "1" and "2"
4. Click Diff at the bottom of the Memory Profiler window
5. Change the view drop-down to 'Memory Map Diff'
6. Observe tiny orange highlight next to the 1st address, also observe the data in the bottom table
7. Click anywhere on the 1st address
8. Click back to where to original orange highlight was
10. Observe the data in the bottom table

Expected result: Snapshot table shows the same data when highlight backs to its default position
Actual result: Snapshot table shows no data when highlight backs to its default position

Reproducible with: 2018.4.27f1, 2019.4.11f1, 2020.1.6f1, 2020.2.0b3

Reproducible with package versions: 0.1.0-preview.2, 0.2.5-preview.1
Could not test with package versions: 0.1.0-preview.1 (Memory profiler window layout is different)