Maybe they should make a teleport an actual, INSTANTANEOUS teleport. The way you see entities and players fly off when teleported, along with this issue, both imply that it's actually just a very very fast noclip movement, which is obviously why it sometimes shows crap in-between.
It appears this error is mistakenly shown whenever a command is executed with a selector that can't find anything. If I had to guess, I'd say a selector that finds nothing evaluates into Null or some such value, and is then, regardless of this, used as a UUID for the command, resulting in an "invalid UUID format" error.
And yes, it is still an issue in 14w30c.
Issue still persists in 14w30c.
I have experienced this issue many times, it's quite annoying.
Same problem happens to me with various different versions of a teleport command. Happens most often when using @p, but seems to be somewhat random.
How many times is this gonna be reopened?
This is never getting fixed is it