Don't expect a Sunday train to York. Also, Pontefract Baghill is a location listed on some documentation that I have seen, but then so is Doncaster, so maybe its both!https://www.orr.gov.uk/sites/default/files/2021-02/s22-abellio-east-midlands-1st-sa-supplemental-agreement.pdf
EMR 1st Supplemental Agreement May 21 Timetable has now been approved by ORR apparently. Schedule 5 Table 2.2 seems to have additional passenger train slots York to London and London to York on Saturday and Sunday (in addition to the normal London to York, York to London on Saturday and Leicester to York, York to London on Sunday) so it seems there will be 2 each way to York if I am reading it correctly. It definitely says via Doncaster.
Can only hope that Covid doesn't ruin things.