Lion clan monks unable to work

In a multiplayer game as lion clan, I captured a tile with a Vedrfjolnir (the scouting bird). I built a monastery on that same tile and assigned 1 monk to it, who started to heal the bird. Then I upgraded the monastery, which caused the monk to become idle and unable to work (could not heal, generate lore, build relic, etc).

To try to fix the problem I built other monasteries, and monks assigned to those also could not heal. I deleted the first monastery and rebuilt it, which also did not solve the problem. For every monastery, on mouse over, it showed the Vedrfjolnir as needing healing and "healed by another monastery".

I even specced into "Miraculous Healing" hoping that the monastery on the bird tile would heal it, but that also did nothing. The bird was stuck on low hp with healing "+" on it all game.

I ended up losing the game because I could not build a relic or generate lore as lion.