I'm not entirely sure if this is really a bug or intentional. It seems like the Oar has the same mechanical qualities of other weapons (does not auto re equip on break). However, you cannot actually attack with it since character is forced to punch even if an Oar is equipped.
Based on that I assumed it would reequip new tool on break, since the Oar seemed more like it functions as a tool like axes, pickaxes, shovels, etc. (that auto-reequips on break)
Could be intentional, could be hindsight. Just figured might as well report. Doesn't seem like anyone's reported it yet.
Steps to Reproduce
1. Have two Oars 2. Equip one and use till it breaks 3. On break, nothing. (Assumed Result: reequip second oar which doesn't happen)
This issue has been fixed in either a future version or updated in a previous version.