Shipping Vs Development differences

Development Platform & Builds
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Wondering if anyone has any clues as to why certain things might behave differently in Shipping compared to Development builds. I’ve found two issues that are baffling me:

  1. A ‘falling rock’ BP that simulates in PIE/Dev, but not Shipping. This is a simple BP with a SM as root component which is triggered to sim physics via an activator (just a BPI call to it)

  2. A ‘water volume’ BP that works as one would expect (player swims inside of it) in PIE/Dev but in Shipping the player swims on top as if their capsule is colliding with a component. This BP contains a large box collision component set to overlap (to detect player) and a HISM component with collision disabled (the water surface). Its root is a default scene component.

Both BP’s have the parent class of Actor.

** EDIT : further investigation shows likely issues with specfic collision settings on specific actors NOT being respected in shipping build. I saw some chatter about this way back in 4.x, just wondering if anyone has ever come across something similair and might have a hint at where to look.

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Follow up in case anyone else ever finds themselves in this pickle. As moreoft than not in my case, user error was the root of the issue (some actors were fighting over who got to be the overlapped object due to incorrect collision channel settings).

The lesson learned for me was that Shipping build shoved this issue in my face, while Dev and PIE were for some reason more forgiving. Technically speaking, these systems should have malfunctioned everywhere.