(https://i.postimg.cc/k4355JcS/owwdisplaybug.png)
As the topic states, while converting my SEB Lems levels, this has been a grappling problem for the last few levels I've made. While it doesn't affect playability, it's more about how it looks. There is no option to disable the allow one way on the steel pieces, it is greyed out on steel.
This happens on the player if added as an external level and when pressing play level on the editor which I assume are the same player anyway.
Thanks for reporting. The paint check was previously only looking for the 'No One Way' flag; Steel bricks have now been added to this check.
Fixed in RLPlayer commit 842c673.