Artifacts on screen

I seem to be experiencing the issue that was fixed in 1.12 "fixed bug when some artifacts like 0m or 39;49m were appeared in the screen." as well as random line breaks

To recreate: Connect to discworld.starturtle.net:4242, chose option G to create a guest character, then walk around. Columns can be adjusted like "cols 65" to make the random breaks more obvious.