You can then continue fighting the shadow, and even get the sanity boost, without ever being fully insane.
Steps to Reproduce
Get your sanity low enough for non-hostile shadows to spawn, then ram them with the quackering ram.
Get your sanity low enough for non-hostile shadows to spawn, then ram them with the quackering ram.
A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.