These two mainly:
https://github.com/EpicGames/UnrealEngine/pull/2555
https://github.com/EpicGames/UnrealEngine/pull/3369
There are a couple more PR’s I supplied that I consider out of date now.
I should really update them.
One fixes collision issues.
The other allows you to set a min speed before triggering collision.
The version we use internally allows for a min speed, a refire delay and a min distance.
This prevents issues on certain odd collision angles that would spam a ridiculous amount of impacts 