i got the same problem.
4.17.2 prebuild version.
my actor was compound by more than 10 child actors. 3 of them use the same class.
i found these 3 child actor components duplicated 5 times or 9 times, but some times maby 11 times or 12 times.
test in Bluerpint Editor’s viewport: move the parent component of these 3 childactor components will found them moved with parent too. but the duplicated components will not move with parent, and i can not select them.
i found these problem cause the these child actor component have animation on click…