I have just posted this as a news link regarding Tilaurakot's "failure", but it is worth repeating here as it includes some interesting observations:
https://kathmandupost.com/province-no-5/2025/07/14/tilaurakot-misses-out-on-world-heritage-sites-list"ICOMOS goes into minute details. Unfortunately, we failed to address some key recommendations. This wasn't a problem that could be solved by officials alone—it required coordinated state-level engagement," said Himal Upreti, chief archaeology officer of Lumbini Development Trust."
"Some observers also point to geopolitical tensions behind the scenes. India, a powerful UNESCO member with significant voting influence, has long been reluctant to acknowledge Tilaurakot as the definitive ancient Kapilvastu. Instead, it promotes Piprahwa and Ganwaria—archaeological sites near Siddharthnagar in Uttar Pradesh—as the Shakya capital."