Zotac ID81 remote with LibreElec 9.2.2

Upgrading from OpenElec 7.0.1 to LibreElec 9.2.2, I found many of the buttons on my remote – namely the "Windows" and Teletext buttons – no longer worked.  It's an external remote & USB receiver combo that's bundled with many Zotac Mini PCs, like the ID81.

The receiver reports as a PHILIPS MCE USB IR Receiver- Spinel plus (Device ID 0471:20CC).