Beacon Border is Incomplete

I made a beacon in my survival world and the border is supposed to be 50 blocks radius in a square, so 50 blocks outward (north, east, south, west of the beacon) and then connected to be a square but on this there is a chunk missing from the beacon effect area. I’m guessing it’s a chunk border that isn’t covered, and I know it’s not out of range because I triple checked coordinates to make sure it’d be within the beacon border but it just cuts off. Sorry if the wording is weird, I just want all the buildings in the beacons radius to be granted the beacon effects but the border isn’t working properly. Thank you a million for reading this, I hope your day rocks!

(Image shows player looking at beacon through a window- close enough that the beacon should be granting effects, but the effect bar shows effects wearing off despite being within the beacon border)