Teleport mechanic not supporting placeholders.
Copy this and put it on an item:
- teleport{spreadh=<random.15to25>;spreadv=1} @self ~onUse
It only teleports me a single block in a random direction.
https://i.gyazo.com/4eb5a735aaf75b3321f7dfdef56948d3.mp4
Version: 5.3.2
Build: a82ea99c
Paper: 1.19.4 (519)