Bug with backdrop-filter in firefox? - css

I'm having issues with backdrop-filter in firefox, but only when one of the parent elements has a border-radius and an overflow style on it. has anyone seen this before? any workarounds?
heres a codepen i made that shows the issue: https://codepen.io/dbillings16/pen/WNKEBMg
thanks in advance
tried adding backdrop-filter: blur(10px); to a div, expecting it to blur the background. it is blurred in chrome, but not in firefox

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