Just like the picture below, 3 parts will combine together.
But the little 2 parts are not thick. Is this scenario risky？
From my experience this could be a little risky, by no means impossible, but I’d probably hunt for a different orientation that didn’t build with islands.
I often print things like that, never had an issue. These are called Islands in the 3D printing jargon and it’s definitely doable, you just have to ensure the islands are well supported.
This should be just fine. I believe we discourage it for Elastic resin, but in general it shouldn’t be a problem.