Cresselia was caught in a snore ball

So I was playing insurgence and then I came across a cresselia I weakened it throw some balls at it and I threw a snore ball and it got in. Was this supposed to happen? Any explanations would be appreciated

Snore balls are perfectly capable of capturing Pokemon. Their ability to put the Pokemon to sleep only comes into play if the capture fails.

But it says that it will fail to capture a pokemon

And the snore ball icon wasn’t there when I checked the summary

From the wiki (https://wiki.p-insurgence.com/Snore_Ball):

“Allows the player to catch wild Pokémon; gives the target Pokémon the Sleep status condition for one turn if it fails to capture.”

Not sure about the icon thing.

Well ok then