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This is more of a solution that I wanted to share for those who struggle with issues like this: https://wordpress.org/support/topic/_post_title-does-not-work-in-post-type/ (I couldn’t post there because it was closed as resolved).
Essentially, in order to make [_post_title] work, it has to be placed INSIDE THE POST LOOP. I had the same issue, and was able to resolve it it by moving the sidebar before “<?php endwhile; /* end loop */ ?>” of the single post template. Apparently, this is where post variables are known, and anything placed outside of that loop is not aware and cannot retrieve the post related data.