Spawning child Blueprint and setting new values to its variables

I’m spawning a Child Blueprint in a Parent Blueprint. I want to set Child variables from the Parent. I’ve set needed variables as Editable and Expose on spawn. In Construction Script I add the Child using AddChildActorComponent, then cast it successfully to my custom Blueprint class and, finally, set custom variable with a value. No errors on compilation. Spawning works almost correct - I can see the Child. I’ve checked the old & the new value. The value of custom variable changes to the new one, but has no effect.

In the example screen-shot I set a new value for the random seed. Changing other variables also has no effect.

It is strange, but the problem was solved after I restarted the Editor =)

This bug should definitely be examined and fixed!