A missing sun temple was not found. The place was known in 1901, but water in the ground stopped the dig.
Debated. The new work found remains of his valley temple, not a whole temple that nobody had ever located.
The temple is at Abu Ghurab, near Abusir. It is about 4,500 years old, from King Nyuserre in the Fifth Dynasty. More than half of it has been cleared. The entrance lay under nearly 1.2 metres of Nile mud. Diggers found the old floor, a limestone column base, and remains of a granite column. Stone facing still lined part of a corridor. They also found a quartzite gateway, an inner staircase, and a sloping ramp. A large stone threshold is carved with temple ceremonies and with King Nyuserre's name. Two wooden pieces from the game senet were in the ruins.
The page does not say what is still argued.
https://www.ancient-origins.net/news-history-archaeology/king-nyuserre-sun-temple-egypt-00102385