It should be fine. Ovens do that on the initial ramp up from room temp. If you want to avoid that in the future just program it to stop at 300F for 10 minutes and then continue on to 350 for one or two hours (whatever time you normally use). It will overshoot the initial 300 but still be under 350, and then after it has stabilized at 300 it will proceed to 350 without overshooting by more than the normal few degrees ....
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