First of all, you're asking me to divine what the U.K. or Norway are thinking, for example. I think those are the two countries you mentioned.
Let me say this. There have been criticisms of the waiver proposal because it may not actually achieve the result, which is to increase vaccine production for a variety of reasons; but no WTO member has said that they do not wish to discuss this issue.
This goes before the TRIPS council, which is a council of the WTO, and there is a 90-day period for proposals to be discussed. Every time the 90 days has come up, the membership has unanimously agreed to continue those discussions.
What I hear from the members you have mentioned is that there is some suggestion that the proposal will not actually address what it is intended to address.
Honestly, the best people to answer that question would be those members themselves.