Flyway parsing bug: unable to decrease block depth below 0

[SamuraiPrinciple]

Which version and edition of Flyway are you using?

6.3.3

If this is not the latest version, can you reproduce the issue with the latest one as well?

(Many bugs are fixed in newer releases and upgrading will often resolve the issue)

Which client are you using? (Command-line, Java API, Maven plugin, Gradle plugin)

Command-line

Which database are you using (type & version)?

MySQL 8.0.19

Which operating system are you using?

macOS, Linux

What did you do?

(Please include the content causing the issue, any relevant configuration settings, the SQL statement that failed (if relevant) and the command you ran.)

drop procedure if exists p1;

delimiter $$
create procedure p1()
begin
  loop
    if (true) then
      select 1;
    end if;
  end loop;
end$$

delimiter ;

What did you expect to see?

Success

What did you see instead?

Flyway parsing bug: unable to decrease block depth below 0