Seven, are you still having the issue?
I can’t TP offline players, but I can delete you player dat, which will place you at spawn, but unfortunately also remove all your items and inventory.
Unfortunately FTB Infinity is becoming increasing unstable, it’s more to do with too many plugins being left not updated, all those little problem blocks are starting to bubble to the surface. As FTB are no longer maintaining the modpack it’s not going to get any better.
Thus I’ve added crackpack, new mods and it looks like you can go to the moon! I’ve only just added it if you want to try it out.
I’ll be making the FTB Infinity World downloadable at some point.