yep. now, i haven't seen said corner but you *may* need to drift it in order to keep the revs up and stop the engine from stalling, if you leave it in 2nd
if you need first, double clutch the downshift. clutch in, gearbox into neutral, clutch out, rev the engine, clutch in, gearbox into 1st, clutch out. takes some practice but you MUST have your foot off the clutch in neutral or you're just rev matching, not double clutching. rev matching won't save your synchros.
the reason why it's not going into 1st any more is because the synchro WAS healthy, now it is worn and it can't match the revs any longer -> crunch.