Redshift bug when working with JSONs and UNIONs

redshift-bug

-- 1. Setup

DROP table bug_table cascade;

CREATE TABLE bug_table (
  some_json varchar(200),
  some_flag boolean
  );

CREATE VIEW bug_view_1 AS
SELECT
  some_json AS json, 'a' AS some_str
FROM bug_table
WHERE some_flag = FALSE
UNION SELECT  
  some_json AS json, 'b' AS some_str
FROM bug_table;

CREATE VIEW bug_view_2 AS
SELECT
  json, some_str, NULL AS index, some_str AS some_str2
FROM bug_view_1
WHERE some_str IN ('a', 'b')
UNION SELECT -- First array position
  json, some_str, 0::smallint AS index,
  CASE json_extract_path_text(json_extract_array_element_text(json, 0), 'list_type') 
                    WHEN 'blah' THEN 'Found blah' || some_str
                    ELSE null
  END AS some_str2
FROM bug_view_1
WHERE some_str NOT IN ('a', 'b');

-- 2. Run

SELECT
  some_str2
FROM bug_view_2
UNION SELECT
    json_extract_path_text(json_extract_array_element_text(json, index), 'content')
FROM bug_view_2;

-- 3. Expected error

[Err] ERROR:  Assert
DETAIL:  
  -----------------------------------------------
  error:  Assert
  code:      1000
  context:   mod == -1 || (mod-VARHDRSZ) == size - 
  query:     1872099
  location:  pg_utils.cpp:997
  process:   padbmaster [pid=15651]
  -----------------------------------------------

Did you ever find a solution to this?