So you do not get this visual brown-grey cooldown on the top in the ritual bar like in the screen shot here where I play client:
http://imgur.com/a/53ms6
For me it works, so I do not know why it doesn't for you.

Hey I just tested this with two PCs in our office and it works fine for all flags for both client and server.
Here a screenshot when I play client:
http://imgur.com/a/SLLYL

But you not even got the red cancel icons?
Maybe we fixed this issue internally but we did not put the fix into a new public hotfix or patch yet.
However this one seems utterly important so I would wonder if we wouldn't.
All I can see it works from my end, so we may try to get this hotfixed soon.
Can you confirm the issue still persists in current public version?

Thank you for the in depth explanation how to trigger it.
This should hopefully be enough to find the cause.
I will export this one to the internal bug tickets.

Thanks for pointing to this, it was finally an easy fix :)
Will not happen in next patch anymore!

Thanks for pointing us to this issue we not thought about this case when implementing shrine lost notifications.
With next Patch unclaiming own buildings will not trigger this notification anymore.