I have lost 1 or 2 plants but the rest are ok?

we have done this many times. when we transport the bags for display, we tend to damage and break off plants.

remove the dead plant/s.
using the dibber, make a new planting hole in the vacant 'T' shape.
gently push in a new seedling
you do not need to lay the bag flat as the potting mix is bound by the existing root systems.