https://wccftech.com/google-pixel-6a-motion-mode-camera-feature/

Google's Pixel 6 series houses its own set of unique features all thanks to the custom Tensor chip. However, the company is also planning to announce a new budget Pixel 6a variant of the flagship soon which will offer more or less the same experience but at a lower price. Google might minus some features to keep the flagship gap in place. In terms of camera performance, it has been recently discovered that the Pixel 6a will not support "Motion Mode" photography.

An Android developer has discovered the evidence from the Pixel Tips app which suggests that the Pixel 6a will not get Google's Motion Mode feature (via XDA-Developers). The Tips app describes Motion Mode code to show up on “PIXEL_2021_EXPERIENCE” devices. This includes the Pixel 6a but excludes the codename "bluejay". The codename referenced "bluejay" has been mentioned several times over the past and its exclusion must suggest that the Pixel 6a will not get the Motion Mode camera feature.