corner location has always 0.125 pixel error

[Yes-Jumby]

Describe the bug i generate a apriltag 36h11 pic to test the corner locations by apriltag lib and theory,but cannot match

To Reproduce here is my pic arucoBoard_DICT-DICT_APRILTAG_36h11.zip

Expected behavior if the corner orign(up-left) of lib is (0,0),the corner should be (9.5,9.5) if the corner orign(up-left) of lib is (0.5,0.5),the corner should be (10,10) but the output is (9.875,9.875)

** Input Image**

** Code version ** 3.4.0 release