Hi Tefel,
I attempted to reproduce this in newer versions of the engine but I couldn’t get your results. However, what you are seeing is likely caused by the large amount of code changes that took place between 4.8 to 4.9+. Also, I’m not entirely sure this is directly related to the original post.
If you would like to keep looking into this, try reproducing it in a newer engine (4.9 to 4.10) or (4.10 to 4.11 P6). If you can reproduce it there, please make a new report in the Bug section and include as much info as possible (repro steps, screenshots, etc).