The group membership pages show duplicate entries.
Database:
MariaDB [db]> select * from group_relationship_field_data where gid = 8;
+-------+------------------------------+----------+-----+-----+-----------+-------+------------+------------+------------------+-------------+------------------+
| id | type | langcode | uid | gid | entity_id | label | created | changed | plugin_id | group_type | default_langcode |
+-------+------------------------------+----------+-----+-----+-----------+-------+------------+------------+------------------+-------------+------------------+
| 122 | translation-group_membership | en | 0 | 8 | 146 | meba | 1701464668 | 1701464668 | group_membership | translation | 1 |
| 19888 | translation-group_membership | en | 0 | 8 | 146 | meba | 1701503068 | 1701503068 | group_membership | translation | 1 |
+-------+------------------------------+----------+-----+-----+-----------+-------+------------+------------+------------------+-------------+------------------+
2 rows in set (0.001 sec)
But:
Closed: works as designed
3.0
Code