Homebridge/Docker overwrites DNS name / clears mDNS name of Synology NAS
As this happens on my Synology NAS, I'm reporting this bug here.
But I'm not sure if this is the correct place/repository as this is probably Homebridge/Docker-related and not originating from the Synology SPK. I can replicate the bug report in the appropriate place if needed.

The Synology NAS is running DSM 6.2.3-Update2 with the latest Docker package.

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Homebridge, installed in Docker via the Synology SPK, started to overwrite the DNS Name / delete the mDNS name of the NAS after the latest Homebridge/Docker update (v1.2.4, initiated via the Homebridge web GUI).

Please see following two attached screenshots showing a LAN scan (Hostname, DNS Name, mDNS Name columns).

<img width="1076" alt="Screen Shot 2020-12-09 at 09 31 15" src="https://user-images.githubusercontent.com/34392542/101611886-58460580-3a0a-11eb-93d0-11ac9faa8b53.png">
↑ Fig. 1 – correct behaviour

Hostname reflects the Server Name setting in DSM (please see third screenshot), DNS name is correct (_fritz.box_ is the local domain provided by the router), mDNS name is shown

<img width="1076" alt="Screen Shot 2020-12-09 at 09 32 21" src="https://user-images.githubusercontent.com/34392542/101612238-b7a41580-3a0a-11eb-92ae-ad6296addc21.png">
↑ Fig. 2 – incorrect behaviour

Hostname is uppercase, DNS name is the Homebridge identifier, mDNS name is gone

<img width="695" alt="Screen Shot 2020-12-09 at 10 43 49" src="https://user-images.githubusercontent.com/34392542/101612949-7eb87080-3a0b-11eb-9e3f-4541ad240bd8.png">

↑ Fig. 3 – Synology DSM Control Panel _Server Name_ setting

If I re-set the Server Name in the _Network > General_ settings of the DSM Control Panel, the Hostname, DNS Name and mDNS name are correct again, only to be overwritten by Homebridge after a certain amount of time. (Usually within 1-5 minutes, I can not determine a consistent timeframe or event when this is triggered.)