I have the same issue
Gateway = Mikrotik wAP lora8
Same issue here… but only since 10 Feb 2020 13h00. Before the location metadata has been sent.
Gateway: LorixOne
Same Problem with Mikrotik Gateway.
Same here, RAK831
Same here with indoor TTN gateway from RS components / Gemtek.
This probleem occurs random over time and type of gateway connectivity (Semtch UDP, MQTT, Basic station). I even see difference per API over which I query data. Ttnctl ptesents different information on opennetwork server and eu. This nondeterministic behaviour is characteristic for the state in which TTN public network is at this moment.
I have got the same problem with the TTN indoor gateway. But I think there is a workaround by searching the gateway id at TTN.
arjanvanb explained it here: Determine which gateway is used by a given node
So you put the gateway-id in the url and get all JSON data including the position. Example: https://www.thethingsnetwork.org/gateway-data/gateway/eui-0000024b080606d8
https://www.thethingsnetwork.org/gateway-data/gateway/YOUR-GATEWAY-ID