"Split Clips" ignores "Time Format" first time

When I split an audio clip, I usually want to do it on a specific zero crossing (else I get clicks).
 
The default Time Format is M:B:T so I set my "now" cursor to a zero crossing, change Time Format to Samples and then press OK.
 
But the resulting split is not on the cursor sample! It is on the nearest M:B:T.
 
Once I have performed this bad split, all subsequent splits are correct: on the marked sample. 
 
Ugh.
 
Anyone that do much splitting ever have this issue?