I can confirm that we have experienced the exact same findings.
Furthermore, beyond the noisy depth data returned (likely due to switching to a ToF sensor, which then appears to be upsampled which might explain the "noise"), there seems to be a very concerning bug with regards to how depth data is handled on one side of the face. In all previous devices with old version of TrueDepth (prior to iPhone 13), there is clear separation of z-depth data. HOWEVER, on iPhone 13 variants, there is "blending" of the z-depth on the edge of one side of the face. This is a huge red flag (tested on iOS 15.x). This blending is apparent if you run unaltered apple sample code found here on an iPhone 13 variant (iPhone 13, 13 Pro, 13 Pro Max, 13 mini).
https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/streaming_depth_data_from_the_truedepth_camera
Implementing filtering/smoothing of the data does NOT fix this concerning bug. It is temporal filters, so while it does aid in reducing the "bumpy noise" returned from the sensor, the incorrect Z-depth on one side of the face (or any object scanned) is not fixed. And temporal smoothing can be done by averaging across multiple depth buffers (its nice this is done for you), but I want clean data on a per-depth-frame returned.
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Huge red flag bug in returned depth data from iPhone 13 devices (aside from noisy/bumpy/inaccurate depth). Highlighting issue in previous image posted.
Highlighting (in previous image posted) the bug I mentioned in returned depth data from any iPhone 13 variant device.