EPUB conversion missing title page

I have been mass converting documents, and have noticed that a very small portion of Epubs are not having their title_page.xhtml converted correctly.

I (think) it is becauses these have special characters in the title ( "()<>" ), but I'm not sure how to look further into it. As far as I can tell, the first block that anydoc is registering is from the next chapter/file in the epub.

Reproduce the conversion with EPUBs whose title_page.xhtml contains special characters such as "()<>. Inspect how anydoc registers the first block and compare it with the next chapter/file. Done means the title_page.xhtml content is converted correctly for these EPUBs without shifting to the next file.

Written by the indexing model from the issue text.