Attempting to add collision to an EQSTestingPawn class is not possible, as the inherited capsule component seems to override any new collision. Simulating with the inherited capsule will cause the Pawn to fall through the level.
Found in 4.10.1. Reproduced in 4.9.2 and Main CL 2811183
Created this bug as a result of [Link Removed].
1. Open the editor
2. Create a blueprint based on EQS Testing Pawn
3. Add a capsule component to the blueprint
4. Set the capsule component to BlockAll
5. Place the EQS Testing Pawn in the level
Result: EQS Testing Pawn falls through the level.
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-24985 in the post.