I just noticed that the strikethrough text that I pasted in wasn't rendered. In that example at the bottom Chapter 1 and Chapter 2 should be rendered as struckthrough (illustrating with WikiText formatting):
*Tasks to complete writing goal 1* ~~Chapter 1~~ ~~Chapter 2~~ Chapter 3 -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To post to this group, send email to tiddlywiki@googlegroups.com. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/2d51ffa7-46f7-468f-b9e2-8bf5a368154a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.