Survival bug & hardcore bug

Hi so I recently reported a bug on me having no hearts and still not dying and it happened to me again on a survival server this time I'll tell you how it happens the hardcore one is that I was on half a heart and I toke a 2 block fall and then I had 0 hearts this time I was playing and I died then I respawned and there was a skeleton that was shooting arrows at me then I had 0 hearts thank you for reading