yes, basically doing things from wed on that you know will have issues on the sabbath is problematic. i.e. there's a concept that if one is going to get on a b

yes, basically doing things from wed on that you know will have issues on the sabbath is problematic. i.e. there's a concept that if one is going to get on a boat that is going to be sailing over the sabbath, one should get on sunday-tuesday. not wed-friday (saturday would obviously be an issue). if i had to guess, that is the logic here.