There is often a difference of opinion about what is safe for rabbits to eat. It is a difficult subject.
Some reasons are:
Very little research has been done specifically about rabbits & what they actually eat, except a short note in "The private life of the rabbit" which is a very old book, long out of print. I haven't been successful in obtaining the original, very full research done by a botanist using wild rabbit pooh!.
Some parts of a plant may be fine, but other parts are either poisonous, or become poisonous at a particular stage of growth eg after seeding. It may be unwise eg very hard seeds can break teeth.
It's even more complicated in that a small number of rabbits can inactivate the poisons in individual plants. eg 4% of wild rabbits can inactivate the poison in creeping buttercup. DON'T TRY IT!!!!
I agree that lawn daisies are safe. The leaves are a little high in protein = just watch for foul, uneaten caecotrophs, & be aware of it.
My own criteria have been to visit the many wild warrens in this area & notice which plants are eaten out & which are avoided.
I know 3 large warrens where there are lots of oxeye daisies, (Wild Margerite) in their grazing area. The wild rabbits avoid them completely to the extent that the oxeye daisies took over in 1 area & the rabbits had to move!
There are some good threads about wild plants in the diet section. Those recommended are 101% safe, without controversy & easy to identify.