It got my attention that many players are unaware of current bug with Bonfire, neither it was reported here.
For this, i did sacrifice my own Bonfire and received those messages.
When i used my own Communal Boost Bonfire i had Magic Find Boost from another Bonfire.
Because of currently active Magic Find Boost i wasn't able to activate Magic Find Bonfire for my Allies during Eye of Zhaitan event. Not to fully waste Bonfire, i've activated Karma instead.
This bug bring few problems.
If you have all three Boosts active, 100% Communal Boost Bonfire will be wasted on use.
Communal Boost Bonfire do not allow you to activate-charge any Boost that currently active on you, providing inability to use your own Bonfire to refresh Boost effect.
Only when time of Bonfire Boost effect is run out, it is safe to use and charge your own Bonfire.