Server version: 1.13.2-R0.1-SNAPSHOT git-Spigot-9b4b0a2-f489f0f (MC: 1.13.2)
EssentialsX version: dev-39.182
PermissionsEx version: 1.23.4
Vault version: 1.7.1-b91
EssentialsXChat version: dev-39.182

i cant use @p with tppos in commandblocks
output: player not found

example: /tppos @p 1 2 3 0 0

Looks like #2217

For now I'd suggest using something like CommandHook or PsuedoCommands.

Closing as a duplicate of #2217.