I’ve submitted a fix for this bug in this pull request:
.com/EpicGames/UnrealEngine/pull/2776
Those working with TickIntervals may also be interested in this associated pull request – .com/EpicGames/UnrealEngine/pull/2777 – which addresses the issue brought up here: Event Tick Delta Seconds is wrong when using a custom tick interval - Programming & Scripting - Epic Developer Community Forums