mounting multiple partitions at once seems to give 'DOKAN' drives unless single threaded

[RR7]

sorry i'm new to this, but my scenario is trying to bring multiple drive online in one hit. either a disk image with 4 partitions, or 4 images with 1 partition. it seems that the first one appears correctly with volume label and size, the rest appear as DOKAN 512mb of 1gb used. after a while i can refresh explorer and it picks up the correct details. in single threaded mode this does not happen, but things like file delete keep hanging explorer. the only way around this i've found is to sleep for 2.5 seconds between each partition. it seems like dokan is informing explorer too early that a drive it present before the dokan system is ready to serve it. this doesnt happen in winfsp. am i just doing something wrong here, or is this a known issue?