If there’s some words I don’t know I just hover over it with Yomitan ( https://yomitan.wiki/ ).
I use Bunpro for quickly acquiring lots of grammar points to keep fresh in my memory while reading other material I’m interested in to recognize it there and really solidify the knowledge through interacting with a language naturally, not for testing vocab knowledge.
If you also use Bunpro for vocab I would still give it correct even if you forgot a word in the sentence, it’s your grammar SRS not your vocab SRS after all, but if you see a word in a grammar sentence that you know you forgot and it shows up in vocab right after, you may as well give yourself a fail on the vocab SRS to ensure you see it a few more times. I don’t use bunpro for my vocab srs (though I might’ve if they let me test both meaning and reading with input, pretty please?), but when I do my vocab srs I also give myself a fail if I take too long to remember a word.