The ball hits the padding on a door frame or net post
The FIP rules require the padding but do not say how a ball off it is treated. It is fixed to the door frames and the net posts, which both count as part of the court, so most players treat it like the frame or post it covers. Agree it before you start.
Why the padding is there
On courts used for outside play, the edges of each opening and the net post must be padded with at least 2 cm of cushioning, firmly fixed, so a player who runs into them is protected. It is meant to stick into the court as little as possible.
What the rules say about a ball hitting it
Nothing directly. The rules list the walls, the mesh and its frame, the ground, the net and the net posts as parts of the court, and the padding is fixed to those frames and posts. They do not mention the padding itself as part of the court or as an object outside it.
How to handle it
The usual approach is to treat the padding as the frame or post underneath: fine after a bounce, a lost point before it, and a ball off the post padding that then lands in the other court is good. That is common practice rather than a written rule, so agree it before the first serve. In a refereed match, the umpire decides.
Fragen
Is the padding on a padel court part of the court?
The FIP rules do not say. Most players treat it as the frame or post it covers, and in a refereed match the umpire decides.