Handlers bound to "keypad-5" are ignored

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Any handler set to "zone": "keypad-5" doesn't trigger any lighting on the keypad number 5.
No issues with binding any other keypad key. Also setting the zone to keypad (every key) does affect the number 5 without any issue, it just cannot be individually addressed.

Device: SteelSeries Apex 7 keyboard (set as rgb-per-key-zones)

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Workaround: Using custom-zone-keys and the HID code (0x5d or 93) corresponding to number 5 properly addresses the key.