Poor quality images from Export for Screens
Images from artboards containing embedded raster files output using Export for Screens are of decidedly lower quality than those output from Save for Web.
This is being reposted as it has been closed erroneously by Adobe admins.
Notes for Admins: This is not a resolution export setting problem. This is also not a rendering intent problem (i.e. changing the anti-aliasing setting does not fix the problem.)

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Peter commented
I thought I'd post an update as I've had the opportunity to test this on a new machine.
Unfortunately I can confirm that Export for Screens -> JPG still exports as Type Optimized (hinted) even when Art Optimized (Supersampling) is selected.Exporting to PNG however produces the correct results.
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Peter commented
Hi, please find the sample file attached.
To reproduce the error use the Export for Screens tool, and select JPG output (in the configuration panel ensure that the output anti-aliasing is set to Art Optimized)
The visual errors are highlighted by the arrows.
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Peter, please provide the test file that results this image when exported and exact settings you use to export it.
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Peter commented
Images from artboards containing embedded raster files output using Export for Screens are of decidedly lower quality than those output from Save for Web.
This is being reposted as it has been closed erroneously by Adobe admins.
Notes for Admins: This is not a resolution export setting problem. This is also not a rendering intent problem (i.e. changing the anti-aliasing setting does not fix the problem.)