Also, the 1999 Kargil War between India and Pakistan took place after both countries had successfully conducted nuclear tests (although Musharraf later claimed the Pakistanis’ delivery systems were not operational).
The Pakistanis made some ambiguous threats suggestive of an intention to use nuclear weapons if the war (which they had started) escalated.
This was a limited, conventional war, started by the Pakistanis in full knowledge that they and the Indians had some nuclear capability (albeit probably not enough to assure mutual destruction).
Given flashpoints like India/Pakistan, KSA/Iran, India/China I wouldn’t have the slightest confidence that nuclear weapons will not be used. Past behaviour of established military powers is not a good guide to future behaviour of rising powers.