ISDv4 devices do not properly set the "Wacom Serial IDs" property. In particular, the device IDs are set to 0 rather than the expected generic values (e.g. 0x02 for stylus and 0x0A for eraser).
Fixed in commit 541504f; due in 0.26.0.
Fixed in commit 541504f; due in 0.26.0.