I don't know if it is the rest period or root rot surfacing. As I have
one that had root rot and the stems went brown and collapsed like they
seem to do with the ones I still have (which are still flowering now or
reflowering t be more accurate).

So I'm puzzled... would this be root rot or rest period? How to tell
the difference between the 2? I would cut the bulb but I don't know
which colour is supposed to have a healthy one. Yellow? White? Brown?