Not working ["Allowed to merge" option to "No one"] in protected branch

HI Team,

Allowed to merge with option "No one" is not working as expected.

Steps to Reproduce:

1. Create a protected branch with "No one " permission for Allowed to merge.
2. Create a merge request target as protected branch
3. Merge the changes

Expected Result: Once we tried to merge with the protected branch it must be not allow to merge but it is merging since i given "No one" permission. Please check