wrong search_path being used

I didn't want to report the bug using the form before confirming it here.

Here is a gist of what I'm trying:

https://gist.github.com/49fcc8c4a5a810f66833#file-cleanup-sql

The relevant part being this:

old_path := pg_catalog.current_setting('search_path');

raise notice 'setting search_path from % to %', old_path, templ;

perform pg_catalog.set_config('search_path', templ, true);

...

select count(distinct transaction_id) from public.transaction_condition
into temp_count;

raise notice '% remaining transactions in public!', temp_count;

select count(distinct transaction_id) from transaction_condition into
temp_count;

raise notice '% remaining transactions', temp_count;

For which I get this result (NOTA is Portuguese word for NOTE or NOTICE,
not sure...):

NOTA: setting search_path from "$user",public to public
NOTA: 1030 remaining transactions in public!
NOTA: 66 remaining transactions

Why do I get different results for both count() queries? The only
difference between them is that I made the schema explicit in the first
call but since current_path is set to "public" there shouldn't be any
difference, right?

By the way, 66 is the record count for stock.transaction_condition after
calling that function the first time for the stock schema.

I've tested the above using PG 9.2.2. Any ideas on what is happening?

Thanks in advance,
Rodrigo.