slow_query_log broken for Last_errno: filed in percona server 8.0

mysql [localhost] {msandbox} ((none)) > SELECT                     SCHEMA_NAME as XYZTest                  FROM information_schema.schemata                   WHERE SCHEMA_NAME NOT IN ('mysql', 'performance_schema', 'information_schema');
+---------+
| XYZTest |
+---------+
| sys     |
| test    |
| test1   |
+---------+
3 rows in set (0.01 sec)  


 # Time: 2020-01-14T12:46:31.378334Z
# User@Host: msandbox[msandbox] @ localhost []  Id:     8
# Schema:   Last_errno: 3554  Killed: 0
# Query_time: 0.007943  Lock_time: 0.002580  Rows_sent: 3  Rows_examined: 13  Rows_affected: 0
# Bytes_sent: 108
SET timestamp=1579005991;
SELECT                     SCHEMA_NAME as XYZTest                  FROM information_schema.schemata                   WHERE SCHEMA_NAME NOT IN ('mysql', 'performance_schema', 'information_schema');

master [localhost] {msandbox} ((none)) > SELECT SCHEMA_NAME as XYZTest FROM information_schema.schemata WHERE SCHEMA_NAME NOT IN ('mysql', 'performance_schema', 'information_schema');
+---------+
| XYZTest |
+---------+
| sys |
| test |
+---------+
2 rows in set (0.00 sec)

# Time: 2020-01-14T15:05:36.041846Z
# User@Host: msandbox[msandbox] @ localhost [] Id: 16
# Schema: Last_errno: 0 Killed: 0
# Query_time: 0.001092 Lock_time: 0.000432 Rows_sent: 2 Rows_examined: 5 Rows_affected: 0
# Bytes_sent: 111
SET timestamp=1579014336;
SELECT SCHEMA_NAME as XYZTest FROM information_schema.schemata WHERE SCHEMA_NAME NOT IN ('mysql', 'performance_schema', 'information_schema');