When you start Minecraft, the launcher prints in the Game Output
[Client thread/ERROR]: Realms module missing
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This message seems to be new in 15w45a so I assumed it was not necessarily intended

Reopening, there is a related issue that's confirmed to not be invalid.

No longer in 15w51b

Not fixed for 16w02a please reopen

I have this version, but it is also strange that for you Minecraft 1.8.9 uses a later version of realms than the snapshots.

That's because snapshots won't work with Realms servers anyway so nobody bothers updating the library there.

I think this should be moved over to https://bugs.mojang.com/browse/REALMS

Hm, it's about Minecraft not finding the appropriate library...

Cannot confirm for 16w07a
16w04a is the first version in which the message did not appear anymore
Invalid, snapshots don't get realms.