Advocates and families lobbied hard for the extension, which the state Assembly and Senate approved unanimously this spring. But supporters said earlier this month that the measure was being held up by a dispute inside the Murphy administration over how to spend federal coronavirus aid. The governor's office would not discuss the delay. Advocates said time was running out, with schools planning graduation ceremonies and crafting individual education plans, or IEPs, that would guide instruction for students with disabilities next year. One group, the Education Law Center, held teleconferences as recently as Wednesday morning advising parents of disabled students to reject diplomas and take legal action if the bill wasn’t signed.