Enclosing vector in initialiser lists calls l-value or r-value overload?

Question

Could someone please explain why the following code, specifically, the three calls to the print function overloads, results in either the l-value or r-value overloads being called when enclosing the vector argument in 0, 1, or 2 sets of curly braces?
https://www.sololearn.com/compiler-playground/cv89oD5cX3Zq

Answer 1

https://stackoverflow.com/questions/75115213/does-wrapping-an-lvalue-in-double-curly-braces-create-a-temporary-object-that-ca