Before todays patch, you could cancel (and therefore end) a continuum split (CS) on chronomancer early by pressing continuum shift (i.e. to not die in Sabethas flamewall or one of the walls at SH).
Now, CS goes on cooldown as soon as it's activated and doesn't give the follow-up skill anymore.
The patchnotes don't say anything about any changes to CS other than it moving to F5.