Some tagged PDF tables have RowSpan/ColSpan for data cells (<TD> tags) defined in Attribute Classes. While these correctly appear in the tag properties under attribute classes, the "Check for Accessibility" feature ignores it.

To reproduce the issue, have a table with a cell spanning multiple rows or columns. Have the correct RowSpan/ColSpan tag under an attribute class instead of a direct attribute object. Run "Check for accessibility."

A small PDF showing this problem is attached. In particular the data cell in the second row with entry "1/2(2T+1)" is correctly tagged as spanning two rows with an attribute class.

Using Windows 11, Acrobat Pro 2024.05.20320.

Expected result: Table passes for regularity.
Observed result: Table fails for not being "regular."