Tabbing is not working in final build

I placed a few MultiLineEditableText components in my WidgetBlueprint and when I run the game in standalone mode I am able to tab through them in the order they are placed, so the user does not have to click every time on the next text box to complete all the inputs. But this is not working when I finally create a shipping build. Then tabbing has absolutely no effect anymore.

Am I doing anything wrong, is there any fix? I thought the Standalone Mode should resemble the final experience as close a possible, but this is quite an important difference to the final build.

Edit: For some reason in other projects of mine, tabbing is working also in the final builds. It nearly seems like the order of my components internally would change in the final build.