How to remove a spaced repetition block?

While testing out the new spaced repetition feature, I created a “foo bar baz” test SRS block. But now it pops up every two days and I can’t figure out how to stop it. Since the SRS feature seems to work based on references, I tried to find the page from which the blocks originate and remove it, but failed. So out of desperation, I’m coming here: does anyone know how to delete these?


The only way I have seen to fix this is to remove the original block.