Teleporting to unloaded chunks(~1,000 blocks away in my case) caused my player to be teleported to those coordinates, however the chunks did not load. When I tried this on my server(also 1.6.1) it crashed the server.
MC-20177
Teleporting to unloaded chunks
Resolved
Incomplete
0
Incomplete without crash report. Please attach crash reports in the future to tickets about a crash.