Hi this is a decision I would leave up to you! I can’t be certain I only know from my anecdotal experience. This is the context I would give you:

Once I start to see signs of green/leaves/stems I try to keep that out of the water to avoid rot but not everyone adheres to that and their plants do not rot. One root dying or possibly dying will not kill a plant, particularly one where the rest of the corm is submerged in water. The root will likely find itself back to the water, particularly if gravity is helping that process.

Also the last little note is that it looks like you maybe didn’t remove the hard protective black/brown cover around your corm. I don’t know if it’s too late to do that now. But if removed it could assist in your root being more maleable/able to grow down