Mock Orange shrub leaves are discolored

Oh, that does look like frost damage. Did you get hard frosts this winter?

I've been surprised at what has been damag over here,, Daisy. My Euonymus 'Emerald 'n' Gold' which is hardy has its tips affected!

Wait a while and then after it has flowered, prune out the damage. If you do it now, you'll lose the flowers.

Agree it will be frost. I have found the same with Choisya.