Oracle Apex Server-side Code do not set item

I want to make simple region: input field, button to send request to DB and read-only field to display result.

Here are the PL/SQL Code:

begin
  select
  edrpou || '; ' || nameorg || '; ' || short_name || '; ' || address || '; ' || boss
  into :P206_SEARCH_RESULT
  from dual
  left join (
    select * from (
      select
      trim(d.edrpou) edrpou,
      trim(d.nameorg) nameorg,
      trim(d.short_name) short_name,
      trim(d.address) address,
      trim(d.boss) boss,
      d.date_d,
      max(d.date_d) over (partition by trim(d.edrpou)) max_date
      from edrpou_ d
      where trim(d.edrpou) = :P206_EDRPOU_SEARCH and trim(d.short_name) is not null and d.isactual = 1
    ) e
    where e.date_d = e.max_date
  ) on 1=1;
end;

Item P206_SEARCH_RESULT is null after button click. I checked query, it's working in Developer.

I followed suggestion to reproduce issue on sample data and recreated it on free Apex workspace. At first I couldn't reproduce it, but then randomly found problem cause. Turns out problem is in item. It is of type "Textarea". If you leave everything by default - it works as intended. But if you set it's Height to 1 line - it's stops working! Item's value always null.

This is super weird, looks like a bug.