Light Issue in Minecraft 1.16
I was in progress of building a mansion in Minecraft (all blocks were White Concrete) and used the /fill command to set up a foundation. There were a few trees in the way so I blew them up with TNT. However, after I destroyed a tree in the bottom right corner of the screenshot, there is a dark patch with minimal light despite no blocks were blocking the way. There was even more light when the tree was there. At first, I thought, if I placed a block there, it would resolve this glitch but unfortunately, it didn't.
What I expected to happen was...:
I was expecting to destroy the tree then the lighting would be normal as if it was noon.
What actually happened was...:
After I blew up the tree, the patch where the tree was at instantly became much darker. There is nothing obstructing the way of light and this has not happened in previous releases.
Environment
OS: Windows 10 Pro
Minecraft Version: 1.16
Created Issue:
Light Issue in Minecraft 1.16
I was in progress of building a mansion in Minecraft (all blocks were White Concrete) and used the /fill command to set up a foundation. There were a few trees in the way so I blew them up with TNT. However, after I destroyed a tree in the bottom right corner of the screenshot, there is a dark patch with minimal light despite no blocks were blocking the way. There was even more light when the tree was there. At first, I thought, if I placed a block there, it would resolve this glitch but unfortunately, it didn't.
What I expected to happen was...:
I was expecting to destroy the tree then the lighting would be normal as if it was noon.What actually happened was...:
After I blew up the tree, the patch where the tree was at instantly became much darker. There is nothing obstructing the way of light and this has not happened in previous releases.
Environment
OS: Windows 10 Pro
Minecraft Version: 1.16

Hi there!
When was this world started? Was it started in 1.16, or earlier? If earlier, which version?
Yes, this was started in 1.16.
Have you opened the world in 1.15.2 after opening it in 1.16?
I just relaunched Minecraft and it seemed like this issue is resolved. Thanks for the help!