Historically and due to lack of knowledge about process the ACPI IDs for some devices are abusing the specification. As of today the v6.4 of it
[1] says in the chapter 6.1.5 "_HID (Hardware ID)":
A valid ACPI ID must be of the form “NNNN####” where N is an uppercase letter or a digit (‘0’-‘9’) and # is a hex digit. This specification reserves the
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