diff --git a/tests/bugs/gh_7243_test.py b/tests/bugs/gh_7243_test.py
new file mode 100644
index 00000000..cae46170
--- /dev/null
+++ b/tests/bugs/gh_7243_test.py
@@ -0,0 +1,50 @@
+#coding:utf-8
+
+"""
+ID:          issue-7243
+ISSUE:       7243
+TITLE:       Some UNICODE characters can lead to wrong CONTAINING evaluation when lower/upper uses different number of bytes in its encoding
+NOTES:
+    [22.02.2023] pzotov
+	Confirmed bug on 5.0.0.523, got exception
+		Statement failed, SQLSTATE = 22001
+		arithmetic exception, numeric overflow, or string truncation
+		-string right truncation
+		-expected length 2, actual 2	
+    Cheched on 5.0.0.958; 4.0.3.2903 - all fine.
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory(charset = 'utf8')
+
+test_script = """
+    set list on;
+    set blob all;
+    create table tmp_test(id integer, note blob sub_type 1 segment size 80 character set utf8 collate unicode);
+    insert into tmp_test(id, note) values (1,'ɬ');
+    commit;
+
+    set count on;
+    select a.id,a.note as note_blob_id
+	from tmp_test a
+    where a.note containing 'ɬ';
+"""
+
+expected_stdout = """
+	ID                              1
+	NOTE_BLOB_ID                    80:0
+	ɬ
+	Records affected: 1
+"""
+
+substitutions = [ ('NOTE_BLOB_ID .*', ''), ('[ \t]+', ' ') ]
+
+act = isql_act('db', test_script, substitutions = substitutions)
+
+@pytest.mark.version('>=4.0.3')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute(combine_output = True, charset = 'utf8' )
+    assert act.clean_stdout == act.clean_expected_stdout