Tvheadend

This bug report is related to feature request https://tvheadend.org/issues/5460

After going through the tedious job of manual deduplication of muxes and services,
I noticed the next scan brought back duplicate muxes immediately.

My manual deduplication was on one of my five DVBS networks, Astra 1 provided by
SAT>IP using a Telestar digibit R1 running satip-axe.

Before deduplication, almost every mux was duplicate, sometimes triple.
I deleted every service on Astra 1 not mapped to a channel, including hidden services.
I deleted every mux on Astra 1 with 0 services
For the remaining services, I carefully picked one mux and made notes of the channels that would be affected.
Then I forced a new scan, so I could re-map the now lost channel mappings.
Then I noticed the duplicate muxes coming back again.

These are muxes that are duplicate again:
10758.5V
11111.75H
11258.5H
11391.25H