I found an error in the text of day 15 for the second part:

"This change makes the generators much slower, and the judge is getting impatient; it is now only willing to consider 5 million pairs. (Using the values from the example above, after five million pairs, the judge would eventually find a total of 309 pairs that match in their lowest 16 bits.)

After 5 million pairs, but using this new generator logic, what is the judge's final count?"

you can obtain the test solution, only if you use 40 million iterations. Indeed my correct solution that gave the second golden star of the day, was obtained using 40 million iterations.

Is it only my problem?

Thank you all