Counter teleport hack techniques for non-authoritative game

We have a game mode which makes intensive use of root motion. In this game mode we disable authoritative movement and allow the client to send his position and rotation without letting the server verify it.

Currently we only check if it's possible to move from point A to point B with a character speed of C. But are there any other techniques to avoid teleport hacking? Unfortunately with our movement check it's still possible to teleport through doors if you stay in front of them.

I've read that fortnite also doesn't have authoritative movement, anyone knows what countermeasures they use?

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