Just take a look at 22613 Sangrami SF.
No halt at BLS whereas the return one 22614 got BLS halt just recently.
The funniest example is 22831/22832 SSPN SF which is a SER train. No halts at JER, BLS, BHC, JJKR, CTC but having a halt at Kalupara Ghat station which is a mere passenger halt.