Spotlight Source Radius is causing sharp circular reflection

Here is a video showing the issue: https://streamable.com/pg21e

I want soft shadows from that light and thus have the Source Radius set pretty high (between 50-75). I also have puddles on my floor and a weird, sharp circle reflection has appeared in the reflections of the puddles. Is this an engine limitation or is there something I can do about this?

Thanks for any help.