Inverted flexbox not scrolling in Mozila?

Question

css

Hello.
I understand that the answer is most likely very simple, but I can not understand why?
There is a block:

overflow: hidden; 
position: relative;
width: 70%; 
height: 80vh;

It has an absolutely positioned block, but reversed by flex on the contrary
. I will not write all the properties, the block is almost the size of the parent.

position: absolute;
display: flex;
flex-direction: column-reverse;
overflow-y: auto;

In Chrome, everything works correctly, but in Mozila, the scroll does not appear and, accordingly, what is hidden does not scroll.
If I do flex-direction: column; , then everything scrolls, and if reverse, then no. Why?