Incorrect reading order for anchored objects
InDesign is placing text and objects in the incorrect reading order when exporting to accessible PDF when an anchored object is anywhere but at the bottom of the page. Instead of placing the anchored object/group of objects in the correct order, it is placing them at the end of the reading order. An example would be an anchored group of a placed Illustrator graph and it's title text box.
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Kristiane Ecker commented
I also realized this happening sometimes (not always, which makes it hard to reproduce). sometimes the anchored object is placed at a different spot, where it is not anchored.
I added screenshots as an example. The anchor in indesign is put after the word "Vergnügen." but in the tagged PDF it is placed in the middle of the paragraph.