Firstly, I’m aware that this is not exactly a bug in WK itself, but a consequence of how it interacts with another piece of software. But still, that other software is also very commonly used by Japanese learners, and the cause of it (title attribute) might not have been intentional.
When I hover over an example sentence in the Context section of the lesson, a tooltip with “Context Sentences” appears. But if I try to look up a word in the sentence using the Yomitan extension, by hovering over the word and holding Shift (or whichever key is configured in the settings), the tooltip overlaps the Yomitan panel and often hides the top of it (which includes the reading). Which I do quite commonly since example sentences very often contain vocabulary that’s not yet been introduced. Example (with a word I do know, but just to illustrate it):
This only started happening in the last week or two. It only happens in lessons, not reviews. I’m using Firefox.
It’s caused by the <section> tag that contains the context sentences having a title=“Context Sentences” attribute.
I know that title attributes have a purpose - to show additional details for content, or for accessibility - but in this case it just repeats the text in the section header so doesn’t add any new information. Between that and the fact that it only happens on lessons not reviews, it feels like might not have been an intentional change.
If this really is a feature rather than a bug, I’m sure I could put together a quick userscript to remove the attribute, but it would be good to confirm that first.