I tagged this as engine / physics, apologies if this isn’t the right category.
I noticed while trying to use the spatial query API that certain CFrame / Size combinations are not being detected. I tried using both the new and old filter overlap params in addition to no overlap params at all.
I noticed that if I rotate or move the “inside” part then it gets detected, similarly if I adjust the bound part it can also fix the issue.
Here’s the placefile from the above images.
Repro.rbxl (50.7 KB)