Prototypes anywhere are piecemeal only.
When was the last trial of Helina? Helicopter launched Nag missile (then named Dhruvastra) has been tested in the lofted trajectory in 2020 itself. No news of Ladakh tests came out for that variant, did it? We lost 2-2½ years there itself. Fabrication alone of one missile, that has already been fabricated before, cannot take 2 years- it's not a space shuttle. It seems to be a clear cut case of scope creep in testing protocol. If the users had asked for 5 missiles instead of 1 for testing the development labs could've very well supplied(maybe a slightly longer delivery schedule).
Last trial of Helina was in 2021. That too was a joint trial. That has been done in Pokhran range. In 2018 test, a new upgraded seeker has been used, but it was a imported one. The test was a partial success then. The inhouse upgraded IIR seeker was tested in 2021. First it was a ground based test of Dhruvastra, then aerial test in Pokhran.
Now while testing from aerial platform, you are not just testing the missile, but the launching platform too. Moreover the onboard power supply of Helina works for around 2 hr in desert condition. What is its durability in cold subzero temperature? Has it been mentioned anywhere?
What would be the effect of launching a 40kg+ missile at 5k mtr altitude on the helicopter? Remember that it was a LOBL launch whereas LOAL launch is still pending. Now remember that it was already been demonstrated in ground based test. But when you have to carry it out from aerial platform, you have to work on both the onboard RF transceiver. That too would work or show different characteristic in hot desert and cold mountainous condition.
So when it is said that Missile test was a success, just remember that media only reports whether it hit the target or not. They would not report or would never be told about how the missile as a system worked.
Another point to note which is never discussed is, how it has acted against the general protective measure of the target.
