With the following text:

(  foo  (bar))

If the cursor is|:

(  |foo  (bar))

via lead, as expected to:

([  foo  (bar)])

where the selection is[]

If the cursor is|:

(  |foo|  (bar))

via lead to:

(  foo  [(bar)])

where the selection is[]

We would expect the vanilla Vim behavior

([  foo  (bar)])