Modpack version
1.36a (Latest)

Issue
We updated from JourneyMap 7.5.0 to JourneyMap 7.5.1 in version 1.36 I believe. Today I tried teleporting using JourneyMap and I get the error

/jtp failed 
Usage: /jtp <x y z dim>

The reason I call this a "possible issue" is that I'm also dealing with a corrupt chunk in the same area... fixing that is my priority, rather than testing this. I will update the issue once I've tested it

P.s. The corrupted chunk is unlikely to be the fault of the modpack... I just pulled a stupid move and had multiblocks crossing chunks. Unless that's been fixed, that's probably what caused the corruption...

Yeah. The only thing that changed in this version is an "API fix", so might be worth reverting to the previous version whenever the next update is needed :) I just reverted to the previous version on my end, no problems

That sucks :/ As a workaround you can use another interdimensional tp command: /rft rfttp x y z dim iirc
If this is a JM issue, it most likely will not be solved tbh - The last JM version for 1.12.2 is a year old.