Reproduction steps:
1. Open a new or an existing project
2. Open the Package Manager window and install the Memory Profiler package
3. Build and run the project (make sure Development Build is enabled)
4. After the Player loads, go to Editor -> Window -> Analysis -> Memory Profiler
5. Switch from 'Editor' to the Player that is currently running and take a snapshot

Expected result: The snapshot is taken
Actual result: The Editor freezes

Reproducible with: 2019.3.12f1, 2020.1.0b7, 2020.2.0a8
Not reproducible with: 2018.4.22f1, 2019.3.11f1, 2020.1.0b6, 2020.2.0a7

Stable reproducibility may depend on the platform, initially reported as only Linux but can happen on any Editor platform capturing any Player platform.