I decided to do my own research on the Panchasheel agreement. If my sources are correct, the agreement was ONLY between Indian and China. Didn't find anything that included Nepal as being a participant in the agreement.

And the agreement mentioned "non-agression", "peaceful co-existence" between the two countries. Didn't Indian and China fight two wars in the 60s? So I guess we can exclude the Panchasheel Agreement from this discussion.