Construct 2 is now on long-term maintenance support. If you need better support you should upgrade to Construct 3.
The problem is that the "Set angle" action can make the player overlap the ground, which is not allowed by the Platform behavior. This causes it to activate its emergency "get me out of here" routine. This typically produces poor results, but by chance the previous algorithm worked well in this case. We recently adjusted the "get me out of here" routine to better handle the common case of moving walls. This improved a number of games, but in this case, prevents it working as well as it used to. Since we have to pick which way works, I think we have to go with the current way, since it's important the Platform behavior works well with moving walls. The good news though is you can get the old routine back by adding the Custom Movement behavior to the player, and after the "Set angle" action, use "Push out of solid (nearest)". That's exactly what it was doing before and gets it working again in the latest release.