Truncated packets in ogg vorbis

In the ogg vorbis spec, it is mentioned that 'packets are designed that they may be truncated(padded) and remain decodable'. Are there any limitations to this truncation i.e., if the packet is truncated, is there any limitation on where the trunction can start? Or the truncation can start at any stage of encoding?

For example, truncation can only happen after floor decoding etc.,