added servers to unbound DNS-over-TLS are marked disabled

[opnnewbie]

even when I explicitly make them enabled; either by:

- enabling all of them with the top generic checkbox
- enabling them one-by-one with its associated checkboxes

when I apply the configuration all are shown enabled as I specified
when I select any other option on the GUI and then revisit the DNS over TLS page all of them are shown disabled

is this normal behavior or what ?

By the way I already-cleared the former (plain-DNS) servers on [System | Settings | General | DNS servers] and unbound is working as expected so I assume the servers added on DNS over TLS are honored.