Question about refresh and certain blocks

first of all, brilliant plugin – thank you! i’ve noticed that when i went and removed a single instance of a block (where it indicates 1 instance), the screen never updates to show that the block is used 0 times (tried reloading multiple times) – is that by design?

i also wonder if there are certain blocks that this can not see. for example, i have some “stackable” blocks on my site, but they do not appear in the list from “find my blocks”