Can you take a front-on view please?
Retained deciduous teeth are occasionally a problem as they can affect the direction in which the main canines grow, pushing them eg forwards and inwards. If this is mild and doesn't cause the adult tooth to rub other teeth or dig into the gum, then it should be fine. A further problem is that the gap is a trap for food and then gum disease. There is already some inflammation there. As they should be gone at 6 months, I'd probably for taking it out. But I'd need to see it to be sure...
Post lockdown trip to the vets!