Starting with pandoc 3, the docx writer adds a <w:jc w:val="start"/> tag to the <w:tblPr> that provides formatting for tables. Based on the commit that added it, it looks like it had to do with getting tables to format properly when they're in lists. It gets applied to all tables, though, which left-aligns tables that were previously centered in the body of the text.

I'm not sure what the expected behavior is here, so I may simply be doing something wrong on my end. My reference document has set the table properties to be center-aligned... is there some better way of indicating this so the new tag won't be applied? Is there an easy way I could remove it with a Lua filter, or should I just edit the XML after the fact?