My block is intangible and breaks automatically underwater despite being tangible in the code

Hello, I'm creating a little mod for fun but I have a really weird bug. I've made a pearl ore that replaces some blocks of sand in cold oceans, in the MCreator I have everything well set up, the block generation, the tools needed to drop the pearl, sand propierties, etc, but when I run the game, the block is automatically broken and it's intangible. I've regenerated the code a few times but nothing. Can someone help me with this thing? Sorry for my bad english