InDesign now ignores it half the time when I designate an object as an artifact in the object export options panel. I run an accessibility check on the PDF and those objects come up as errors in the alternate text check, and I have to manually desginate them all as artifacts within Acrobat. I know this is a new issue, because I've been working with the same template for several years and locked down all the objects that were supposed to remain the same month to month. Never has a problem until the 2020 update.
Thanks for reporting the issue. We are reviewing it
I discovered that how the item is designated under Object > Content affects whether Artifact translates to the accessible PDF. But of course this is annoying because then you have to go through the whole document (that used to work) and change it to make it work properly.
iMac (Retina 5K, 27-inch, Late 2015)
Mac OS 10.15.6
Adobe InDesign 15.1.1
Michael Custode commented
I can confirm. Having the same issue. Version 126.96.36.199 on an iMac (Retina 5K, 27-inch, 2019) running OS 10.14.6
InDesign 14.0.3 exports the artifact tagged objects correctly, however.