Postgresql range_agg() Return empty list

Hi

Hope you are doing well!

I am using range_agg() function, it works fine with original table value

Query Result <https://i.sstatic.net/CbOkuvXr.png>

But when I try to do some update for range value, it will give back an
empty list

Select range_agg(b.r)From (
Select int8range(lower(bin_range)+1, upper(bin_range)+5) as r
From bin_data) as b;

Query Result <https://i.sstatic.net/19uJeuS3.png>

I test with the same query in fiddle but no issue there

https://dbfiddle.uk/1MRn8hn6

All these query are running on pgAdmin4, wondering why it happens

Thanks
Han