Sometimes this happens with age. Just like my knees.
This is always a challenging fix because you need the replacement to be an Exact match otherwise you need to set up the guitar all over again. Not an easy task on a vintage guitar.
So I cut, milled and sanded the scrap piece to match the dimensions of the original bridge. I then created a jig to cut the saddle slot on the correct angle. I final sanded and stained to match the Cherry to the Rosewood.
To my delight, the grain looks really cool.
The glue up was a success, and the guitar is now back in it's owners hands.