MType PROPRIETARY causing a gs.up.drop

I’m using

The Things Network Command-line Interface: ttn-lw-cli
Version: 3.22.2
Build date: 2022-11-10T13:51:07Z
Git commit: 33e03d104
Go version: go1.19.2
OS/Arch: windows/amd64

Since 2022-11-16T05:57:17 I’m observing frequent gs.up.drop messages of the type:

“data”: {
@type”: “”,
“namespace”: “pkg/encoding/lorawan”,
“name”: “unknown_field”,
“message_format”: “unknown {lorawan_field}”,
“attributes”: {
“lorawan_field”: “MType”,
“value”: “PROPRIETARY”

It is possibly a non-compliant device (not one of mine, I hasten to add) within range of my gateway.
I’ve not noticed it prior to 3.22.2

Has anyone else noticed anything similar?

Just in case anyone else stumbles across this, the issue has been progressed here:

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