The container you are trying to reveal upon hover should not overlap with the element being hovered, this causes the flickering issue you’re experiencing since it’s fighting with the hover interaction and the new element appearing / blocking the interaction.
Assuming there is an invisible container around this bubble that appears when you hover over the tool tip icon, you can see where my mouse pointer is at, this is where the boundary of the container would be if it were visible. This location is also precisely where the flicker begins to happen on my end. Ensure no part of that container overlaps with the container that the tool tip icon is in.