:( It's always difficult when they have started to shoot, as they usually struggle 1st yr. Sounds like slugs & snails, they rather like them allot. I would think if they are moist , which lilies must be & if planted out probably will be, they will come again next year. Lilies hate to have their roots disturbed, so would imagine yours are perhaps putting roots down now. Just make sure the soil around them is moist at bulb depth, if they dry out they will not come back again :'( & crossing fingers may help too..... Good luck. :)