Can not save and load static data in main.yml

[prozhong]

I set a 5:00 static event then save, it turns out like

static:
  300: "clear_daily_kit_record"

seems it can not save data correctly.

I load a correct main.yml which is like

static:
  '05:00': "clear_daily_kit_record"

but it doesn't recognize it and there is nothing in static window
the static data will be lost after save, even I modified nothing