Version : [Public Beta] Version 1.2.12 Hotfix (Nov. 10, 2021)
Where / When : ending moment of the fight against Mardracht
What : though the battle was ended (see image), and the Spirit animal (Wolf in my case) took no damage on that last round (i.e. we just did two Attacks of opportunity against the last Marksmen Skeleton that tried to move away), the Spirit Bond was broken when the post-battle scene played. The game treated this as if the animal had died and my Druid took damage, etc.
You can also see in the image that no damage occurred after the fight. The only AOE present was Spirit Guardians, and no damage is shown.
In the following screenshot of the combat log, you can see all the lines noting the end of the battle... suddenly the Spirit Bond is broken after.
EDIT : my druid was in humanoid form (so it is not related to wildshape "death" or stop.
Steam profile : https://steamcommunity.com/id/baraz/
Comment : it is not an important issue in this case, as the area is finished/cleared once you finish that battle, BUT I am reporting it in case other scenes/endings provoke this bug.
Steam profile : https://steamcommunity.com/id/baraz/