https://wccftech.com/pixel-4a-not-discontinued-sold-alongside-pixel-5a/

Even though Google officially announced the Pixel 5a 5G yesterday, its direct predecessor, the Pixel 4a continues to remain on sale. The company has not provided a reason for keeping the Pixel 4a available, but it could be due to the reasons we have discussed below.

If you visit the Google Store right now, you will notice that the Pixel 4a is available with the Pixel 5a 5G. You may also notice that Google has not introduced any price cut on last year’s mid-ranger, which could be an incorrect strategy, given how companies usually discount previous-generation models in order to keep their sales momentum going, or at least finish off the remaining stock.