Please. I’ve been asked why I didn’t use specific features of kafka in my solution and “because I’ve never used it before only these other pubsub systems” was not the right answer.
Other employers might expect someone who is "Senior" to know about what different languages offer. As others have said, the title "Senior" means different things to different people and not all skills are transferable.
As others have said, if they don't do interviews well, don't sweat it, you probably don't want to work there anyway!