Never seen this door silencer(?) before.
A furniture maker I'm friends with paid me a visit today and he showed me these very handy door silencers. I don't know if that's the correct name in English. They're tiny things and you drill a 5mm hole 8mm deep in the door frame and push it in. I've always used the ones that you stick on but these are much better. I've ordered an assortment with various colours, dark brown, light brown, cherry colour, oak colour, white and transparent.
https://i.imgur.com/3mVVSFZ.jpg