A couple of issues

1. Page breaks go into Wordpress with the text, "PAGE_BREAK: PageBreak"
2. Header Formatting applies to the entire paragraph below what you actually applied that formatting to.
3. Tables do not transfer over, though the data does.
4. Wordpress can show Google Charts, it just requires a publication link. I linked the chart to the Google doc which I moved over the wordpress, but it just shared the still of the chart, not the actual linked chart.

No files or tests are named. Start by reproducing the four reported Google Docs to WordPress publishing behaviors, then trace the publishing entry point for page breaks, paragraph formatting, tables, and linked Google Charts. Done means each item transfers with the intended formatting, table content, and chart link rather than the reported text or still image.

Written by the indexing model from the issue text.