Fix off-by-one issue in `isOverlapping` #1925

Job	Run time
test-linux	2m 24s
tests (windows-latest)	4m 43s
builds	16m 31s
tests (macos-latest)	2m 28s
tests (buildjet-4vcpu-ubuntu-2204-arm)	4m 15s
	30m 21s

Provide feedback