I've seen it happen with wood props that had some time on them. Typically the hub had been compressed quite a bit because the owner failed to use the correct amount of torque when tightening the hub bolts. This happened over and over until the prop washer was welll sunk into the prop hub. Not saying this happened on yours but it's a general cause of wood prop failures that needs to be considered.

A good many people simply run the hub screws down until they are "tight". Usually that level of torque is 3 or 4 times the amount it should have been, continually compressing the prop hub until a small longitudinal split occurs in the hub. Later it travels through the rest of the prop.

Multi bolt hubs should be torqued to 40 inch pounds. Single bolt hubs should have an anti rotation pin installed in the hub to eliminate any slippage and then use the same torque. Props should be checked periodically and discarded when the hub has been seriously compressed or any signs of a split become apparent.

On another tack, you could have struck the prop on something at one time or another starting a tip split as well. It just took some time for the effects to show up.