The Bug:
Minecraft logs are spammed with

Could not authorize you against Realms server: Invalid session id

and

Failed fetching news from Realms, falling back to local cache

and

Couldn't get pending invite count
dvm: Could not connect to Realms: Network is unreachable: no further information

and

Couldn't get trial availability
dvm: Could not connect to Realms: Network is unreachable: no further information

Steps to Reproduce:
I am just playing on a singleplayer world, occasionally I open it to LAN, but it just seems to spit these messages out constantly into my logs.

Observed Behaviour
None in game, just in the logs. Makes it really difficult to read through them.

Expected Behaviour
These messages wouldn't be spammed nearly every second into the logs.