An old bug that was resolved for Mac Mini's, and potentially other older Mac platforms is back. I'm experiencing it in 8.0.1.
The bug is present on Macs that use the IR device ID 05ac:8240 for atvclient. The old thread here describes the issue and the fix: OpenELEC Mediacenter - OpenELEC Forum - Apple Mac Mini and Apple Remote not working (1/3)
I've fixed the problem for myself by recompiling atvclient and changing 0x82 to 0x83 in line 857. The complete fix as posted by the OP in the above thread involved figuring out whether the user's Mac required 0x82 and 0x83, and assigning the proper value to a variable that's used in line 857, rather than a fixed value.
This problem wasn't present in LibreElec 7.0.3, and was eliminated from OpenElec about 3 years ago. I have a feeling that recent upgrades to atvclient in LibreElec pulled in an unpatched version of atvclient, resulting in the problem resurfacing, but that's just a theory.
In either case, would be great to get this fix back into LibreElec officially. Please let me know if anyone needs more info.