Interactive grid removes spaces

Look at the query and result generated in sqlplus :

select plan_line_id , lpad(a.plan_operation||' '||a.plan_options, length(a.plan_operation||' '||a.plan_options)+a.plan_depth*3) OPERATION, a.plan_cost COST, output_rows "ROWS"

 from gV$SQL_PLAN_MONITOR a

 where sql_id ='8gan9d0z7bzhm'

looks pretty cool ;)

And the same result in grid report :

Apex 21 removes all spaces generated by lpad function. The same problem is with classic report and classic grid :( any idea why ?

K.