The bug

I'm only reporting this issue because it doesn't seem to make sense. If you light bedrock with flint and steel and you are given an item with CanDestroy bedrock tag, in adventure mode, hitting the bedrock will not destroy the bedrock (as intended) but will destroy the fire.

To reproduce

1. Place bedrock block
2. Light block on fire
3. Switch to adventure mode
4. Input this code:

   /give @p cod{CanDestroy:["bedrock"]}
   

5. Attempt to break bedrock.
6. See how the fire gets destroyed even though bedrock cannot be destroyed

Unbreakable blocks also affected:
Barriers, End Portal Frames, Command Blocks