Inside a specific folder write attempts return read-only file system error but the file system is mounted as writable

I have only one partition:

UUID=f7918e03-3b77-49f6-870c-6297b11dea0b /               ext4    errors=remount-ro 0        1
#/swapfile                                 none            swap    sw              0        0

If I try to create a folder in / using sudo, it is ok.
When I enter inside folder /snap/vlc I can create a folder or copy a file using sudo.

But if I try to create a folder or copy a file inside /snap/vlc/2344 system returns:
cp: cannot create regular file './158285-clickpause.lua': Read-only file system

❯ ll
total 0
drwxrwxrwx 9 root root 197 jun 18  2021 2344
lrwxrwxrwx 1 root root   4 set 11 16:45 current -> 2344
❯ /snap/vlc                                                 

What's the problem here, how to solve it?