Packing Project for Windows Removes Some Children from Parents?

I packaged a build for Windows, and it looks like I’m getting different behaviour in the packaged build than in any of the editor mode options (including “Play as standalone”). The most crucial issue is that two children objects seem to be detached from their parent game object (blueprint-based game object), i.e. a camera and a solid object that are supposed to follow the parent object, but instead, they stay in their initial positions.

A lesser problem is that the player’s own camera is weirdly rotated when the game begins in a packaged build.

Like I said, these work fine in all editor versions, but the packacking breaks this.

Anyone have an idea why this might be happening?