Our front panel similarly split and curled, only ours had several horizontal splits across it. I went to Harbor Freight and purchased several clamps, large and small ones, and went on Amazon to purchase two bottles of 3-hour epoxy, one bottle being the resin and the other being the hardener. I would mix up small amounts of the epoxy and use a dental-like tool to apply it to the cracks and under the curled up burl layer as far as possible. Then I covered the glued cracks with wax paper and clamped down the raised burl on each side of the cracks firmly flattened into place. I did one linear crack at a time, one crack per day.
I also reglued all the cracks in the Mappa Burl on the cabinets and doors throughout the coach. The one place I didn't get to is the bedroom side of the bathroom-to-bedroom pocket door. Yes, it was a several-week process.
