Liquibase.diff not generating ChangeSet for check constraint on a Postgres column

General Discussion
1

I’m using
Liquibase 4.33.0
Postgres 42.7.3
Hibernate 6.6.15.Final

When I annotation a column as
@Column(nullable = false) @Enumerated(EnumType.STRING) private Source source;

Hibernate 6.x will generate the column as
source varchar(255) not null check (source in (‘TEST’, ‘DEV’, '‘PROD’))

My database was built using Liquibase pre Hibernate 6.x so does not have these “CHECK” constraints on the database.
Production database (does NOT have check constraints)
I build a reference database (does have check constraints) then run Liquibase:diff to compare production to reference - the diff is not noticing the missing constraints.

Does anybody know why these check constraints are not being generated?

thanks in advance