Why is Spring R2DBC Kotlin JPA adding dash and random characters when trying to map my data class fields?

Question

This is for postgresql r2dbc coroutines etc. I've got an Entity that looks like this:

@Table("entity_type")
data class EntityType(
    @Id var id: UUID? = null,
    val entityTypeName: Name, // A string value class
    val systemSchemaVersion: SchemaVersion,
)

And a table that looks like this:

    CREATE TABLE IF NOT EXISTS entity_type (
    id                      uuid PRIMARY KEY DEFAULT uuid_generate_v4(),
    entity_type_name                    character varying NOT NULL,
    system_schema_version   character varying NOT NULL,

and accompanying interface:

interface EntityTypeRepository : CoroutineCrudRepository<EntityType, EntityTypeIdType> {
    override suspend fun <S: EntityType> save(entity: S): EntityType
    suspend fun findByEntityTypeName(entityTypeName: Name): EntityType?

I get this:

    No property 'entityTypeName-9XaHgsA' found for type 'EntityType';

Why on EARTH is it appending "9XaHgsA" to the field/column name? It does this appended field stuff across ALL columns except the ID column.

Note that i'm using value classes, but that doesn't seem to cause a problem - they're automatically getting translated to strings as expected.

Related bug ticket:

https://github.com/spring-projects/spring-data-r2dbc/issues/803