The fix got accepted upstream a long time ago and made it into unstable. Unfortunately, even though Arnaud submitted it to the -stable tree and even though maintainer Andrew Lunn acked it, it never made it into the 4.19 stable series (despite several pings from Arnaud).
Can we just add the patch to the Debian kernel in buster. Without this path, all Orion-based QNAP fail to boot. (Technically, they boot, but without Ethernet, which is how 99% of users access the device.) Arnaud, can you send the 4.19 patch you prepared? -- Martin Michlmayr https://www.cyrius.com/