Replicate the setup from the picture, set the world border center at the location of the platform and try worldborder sizes 140 and 142. The difference between the spawnrates is obvious
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Any size. On the screenshots 32x16 is used.
Any hight. Its only placed here to eliminate any other mob spawns that may be hidden below bedrock
waited for approximately 30 minutes with only 1 mob spawned, while the second screeenshot is a couple of minutes.
> Replicate the setup from the picture
Please provide exact steps to reproduce the issue, to ensure confirming the behavior is reliable. More information like how big the platform is, how high up is it, and how long you waited for the spawns in each set up would all be helpful to know.
There is also a helpful report format here to follow, which outlines how to describe all the necessary information of a report
https://help.minecraft.net/hc/en-us/articles/4408887473421#h_01FF66ASEAVED34B6NDVWZMCYE