https://www.transportenvironment.org/te-asia-pacific/topics/... acknowledges the difference between day and night but claims that the sum of the effects still results in net warming during the day.
Other sources claim that daytime contrails have a net cooling effect:
https://acp.copernicus.org/articles/24/6071/2024/
https://www.newscientist.com/article/2449212-jet-contrails-m...
https://www.carbon-direct.com/insights/contrails-major-clima...
The daytime cooling effect is much smaller than the nighttime warming effect, a total elimination of contrails would be a big improvement, just not as optimal as possible.