I cannot replicate this but some searchers are seeing Google bold the query they used in the knowledge panel blocks. Both Valentin Pletzer and Mordy Oberstein posted examples of this on Twitter. Again, every time I try to replicate it I come up empty handed, without any bold.
Google will bold the text in the knowledge panel, including the block of text, the URLs, etc that match the query. Google does this for normal search results but I have not seen it for knowledge panel or graph sections.
Here are screen shots from Twitter:

a rather strange knowledge panel #google #seo #mobile pic.twitter.com/khxxPR1iGy
— Valentin Pletzer (@VorticonCmdr) January 27, 2019

Am I crazy or is Google starting to use Featured Snippet style URLs, bolded text, and images in the mobile Knowledge Panel? #SEOcc: @rustybrick pic.twitter.com/6sqForoPjD
— Mordy Oberstein (@MordyOberstein) January 28, 2019
Forum discussion at Twitter.

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