Thanks for the answer. This solves the "Profile corrections" problem, but does not solve recognizing the lens as a Sigma Art lens. Instead, Zeiss has still priority on new imports. I have no Zeiss, so I would be able to dump that one, even temporarily.
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Your 'Default Develop Settings' are probably set for Lens Corrections> Profile> Setup> Auto.
To change this select an image shot with the misidentified Sigma lens and click on the master Reset button at the bottom of the Develop module panels This places all of the Develop module controls to their default settings. Next select the correct lens profile and make sure 'Setup' shows as 'Default.' If not select 'Save New Lens Profile Defaults.' Next hold down the ALT key and click on the Reset button again, which should say 'Set Default...'. You'll need to do this for each camera body the lens is used on. The correct Sigma lens profile will now be applied when new image files are imported.
You can also do this with a Develop preset that applies just Lens Corrections, but make sure the Lens Corrections> Profile> Setup is set to 'Default.'
The bug has been corrected in the meantime. It was supposed that Zeiss and Sigma both use the same lens id. Adobe needed to work out an alternate method to determine the correct lens.