We've detected that the same issue solved by MDL-79635 (exactly this change) has to be fixed also in the next 'case' clause of /lib/grouplib.php.

In our case this issue affects to users with the student role but not other roles, but not sure of the exact variable combination that triggers it so I haven't added testing instructions yet.

This issue is affecting the assignment module too (students were receiving that same SQL error when trying to access /mod/assign/view.php?id=12345 pages). The stack trace looks like this when the error shows on the assignment view page:

Default exception handler: ERROR: Incorrect number of query parameters. Expected 25, got 20. Debug: 
Error code: invalidqueryparam

• line 953 of /lib/dml/moodle_database.php: dml_exception thrown
• line 1024 of /lib/dml/pgsql_native_moodle_database.php: call to moodle_database->fix_sql_params()
• line 2296 of /mod/assign/locallib.php: call to pgsql_native_moodle_database->get_records_sql()
• line 3053 of /mod/assign/locallib.php: call to assign->list_participants()
• line 4946 of /mod/assign/locallib.php: call to assign->get_submission_group_members()
• line 69 of /mod/assign/submission/file/lib.php: call to assign->can_view_group_submission()
• line 5300 of /lib/filelib.php: call to assignsubmission_file_pluginfile()
• line 44 of /pluginfile.php: call to file_pluginfile()
• line 45 of /tokenpluginfile.php: call to require_once()