Incorrect definition of table mysql.event: Multiple bugs

My MariaDB instance currently logs the following message:

[ERROR] Incorrect definition of table mysql.event: expected column 'definer' at position 3 to have type varchar(, found type char(141).
[ERROR] mariadbd: Event Scheduler: An error occurred when initializing system tables. Disabling the Event Scheduler.

I have multiple issues with this:

• I've always properly executed mysql_upgrade so the definition should be correct
• The expected type of the column is displayed truncated / incorrect: varchar(
• The actual type of the column is also wrong: mysql mysql --execute 'describe `event`;' shows definer having Type varchar(384), not char(141)

Imo all three of these issues should be fixed