in the latest snapshot when you do /gamerule randomtickspeed 100000 while in the nether it stops time. you cant do any other commands, mobs stop moving, and plants don't grow, but you can place and destroy blocks manually. also when you destroy vines the vines under the original ones dont break.
Environment
Windows 10 Java version my pc can run minecraft just fine
forgot to add a picture that showed the vines