I have this in the config:
disable-player-collisions:

This is to disable player collision

This is now compatible with scoreboard and tablist-editing plugins

enabled: true
worlds: []
Yet player collision is still enabled. Spigot 1.12.2, latest version.

If you have ViaVersion, you can disable it

@NachoMans what is it that you can disable and why?

If you type /viaver autoteam, you can disable player collisions. I don't use this feature since I already have paperspigot.

And what does paperspigot do instead?

Paper Spigot has an option to disable player collisions. Also there are https://paper.readthedocs.io/en/paper-1.11/features/ for a list.