not really a bug but from my pov a not really needed requirement in fb5 fbclient.dll when connecting to a fb<=2.5 database

technically it internally uses always a statement when doing a select * from storedproc that is incompatible to older versions.
is that really required? could that perhaps be based on database ods version added or not?
all fbclient.dll <=4.0 do not do that

select f.rdb$field_sub_type,
f.rdb$segment_length,
f.rdb$character_set_id
from rdb$procedure_parameters pp
join rdb$fields f
on f.rdb$field_name = pp.rdb$field_source
where pp.rdb$procedure_name = ? and
pp.rdb$parameter_name = ? and
pp.rdb$package_name is null

that sql statment is also visible hardcoded in hex editor when opening fb5 fbclient.dll