diff --git a/tests/bugs/core_1142_test.py b/tests/bugs/core_1142_test.py
index 4e434773..946ce1a3 100644
--- a/tests/bugs/core_1142_test.py
+++ b/tests/bugs/core_1142_test.py
@@ -6,37 +6,74 @@ ISSUE:       1564
 TITLE:       Cannot alter generator's comment to the same value
 DESCRIPTION:
 JIRA:        CORE-1142
-FBTEST:      bugs.core_1142
+NOTES:
+    [31.12.2024] pzotov
+    Removed 'SHOW' command because its output can change during intensive development.
+    Also, 'SHOW COMMENT ON <objname>' is not valid in ISQL, see:
+    https://github.com/FirebirdSQL/firebird-qa/pull/33/files
+
+    Parsing problem appeared on 6.0.0.0.570 after d6ad19aa07deeaac8107a25a9243c5699a3c4ea1
+    ("Refactor ISQL creating FrontendParser class").
+    
+    Checked on 6.0.0.570, 5.0.2.1583
 """
 
 import pytest
 from firebird.qa import *
 
-init_script = """create generator T;"""
+GEN_NAME = 'TEST_GEN'
+
+init_script = f"""
+    create generator {GEN_NAME};
+    create view v_show_gen_descr as
+    select g.rdb$description as descr_blob_id
+    from rdb$generators g
+    where g.rdb$generator_name = '{GEN_NAME.upper()}';
+    commit;
+"""
 
 db = db_factory(init=init_script)
 
-test_script = """comment on generator T is 'comment';
-commit;
-show comment on generator T;
-comment on generator T is 'comment';
-commit;
-show comment on generator T;
-comment on generator T is 'different comment';
-commit;
-show comment on generator T;
+test_script = f"""
+    set blob all;
+    set list on;
+    set count on;
+    comment on generator {GEN_NAME} is 'comment N1';
+    commit;
+    select * from v_show_gen_descr;
+
+    comment on generator {GEN_NAME} is 'comment N1';
+    commit;
+    select * from v_show_gen_descr;
+
+    comment on generator {GEN_NAME} is 'comment N11';
+    commit;
+    select * from v_show_gen_descr;
+
+    comment on generator {GEN_NAME} is 'comment N11';
+    commit;
+    select * from v_show_gen_descr;
 """
 
-act = isql_act('db', test_script)
+act = isql_act('db', test_script,  substitutions=[('[ \t]+', ' '), ('DESCR_BLOB_ID .*', '')])
 
-expected_stdout = """COMMENT ON GENERATOR    T IS comment;
-COMMENT ON GENERATOR    T IS comment;
-COMMENT ON GENERATOR    T IS different comment;
+expected_stdout = """
+    comment N1
+    Records affected: 1
+    
+    comment N1
+    Records affected: 1
+    
+    comment N11
+    Records affected: 1
+
+    comment N11
+    Records affected: 1
 """
 
 @pytest.mark.version('>=3')
 def test_1(act: Action):
     act.expected_stdout = expected_stdout
-    act.execute()
+    act.execute(combine_output = True)
     assert act.clean_stdout == act.clean_expected_stdout