I just saw this study on GitHub Copilot from February. Here is the abstract:

Generative AI tools hold promise to increase human productivity. This paper presents results from a controlled experiment with GitHub Copilot, an AI pair programmer. Recruited software developers were asked to implement an HTTP server in JavaScript as quickly as possible. The treatment group, with access to the AI pair programmer, completed the task 55.8% faster than the control group. Observed heterogenous effects show promise for AI pair programmers to help people transition into software development careers.

The researchers report benefits to less experienced developers, which is at odds with this other study I wrote about and my own intuition. However, all of the developers were experienced Javascript developers, and not literally learning programming, which is where I think the more detrimental effect would be.