I just received this email:
"Hello,
You are receiving this message because you have one or more Amazon RDS for MySQL instances running version 8.0.29. The MySQL 8.0.29 community release has introduced a new regression in the InnoDB storage engine [1] which causes the MySQL database process to crash after new columns are added or dropped using the INSTANT DDL algorithm [2]. To prevent customers from experiencing this issue, we no longer allow creating new instances using RDS for MySQL 8.0.29, or, upgrading existing instances to version 8.0.29.
Your Amazon RDS instances running MySQL 8.0.29 are listed in "Affected Resources" tab of the AWS Health Dashboard. On these existing RDS for MySQL 8.0.29 instances, we recommend that you avoid adding/removing new columns using the INSTANT DDL algorithm. If you observe visible symptoms of a crash on your RDS for MySQL 8.0.29 instance, we recommend you perform a Point-In-Time-Restore [3] to recover the database to a time before the first process crash was reported in the logs or before any column changes were made to the database.
If you have questions or concerns, the AWS Support Team is available on AWS re:Post [4] and via Premium Support [5].
[1] https://forums.mysql.com/read.php?22,704532,704532#msg-704532
[2] https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-operations.html#online-ddl-column-operations
[3] https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PIT.html
[4] https://repost.aws/
[5] https://aws.amazon.com/support
"
MySQL 8.0.30 was released today with a fix for this issue.
https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-30.html
https://forums.mysql.com/read.php?22,704532,705126#msg-705126
When will MySQL 8.0.30 be available in the AWS RDS console?