I don't know how they're still doing it but I feel obliged to make you aware this is still happening.
I witnessed this at Grishino, a player pressing themselves up against the perimeter wall of the Church moving up and down it. I wasn't close enough to be able to tell how they were doing it, what item they had in their hands, but it looked similar to when you used to be able too lean into the wall and slide down it.
I challenged the player as I managed to get their name to which they told me "I glitch because everyone does it".
Something is still wrong. Please investigate.
That is all II can tell you at this time. Sorry.
Update with new examples:
https://ibb.co/BN3TmzT - On the left of the door
https://ibb.co/sWXHMHD - On the right of the door
They both appear to be standing, and don't seem to have any items in their hands. That is as much as I can conclude.