jOOQ does not translate SQL properly for H2 database in PostgreSQL mode

The problem is with Postgres ON CONFLICT syntax.

Versions (maven dependencies):

• postgresql: 42.2.9
• jooq: 3.12.3
• h2database: 1.4.200

// mocking connection
final Connection connection = DriverManager.getConnection("jdbc:h2:mem:test;DB_CLOSE_DELAY=-1;Mode=PostgreSQL", "sa", "");
final Settings settings = new Settings().withRenderNameStyle(RenderNameStyle.AS_IS);
Mockito.doReturn(DSL.using(connection, SQLDialect.POSTGRES, settings)).when(mockDbConn).getDSLContext();

// java code for upsert:
dc.insertInto(MY_TABLE)
    .columns(MY_TABLE.TOKEN, MY_TABLE.NAME, MY_TABLE.EMAIL)
    .values(token, name, email)
    .onDuplicateKeyUpdate()
    .set(MY_TABLE.EMAIL, email)
    .execute();

getting the following error log (seems that problem could be because of [*] (line 4 ↓). I cannot understand why it appears and how to remove it):

-- Syntax error in SQL statement:
INSERT INTO PUBLIC.MY_TABLE (TOKEN, NAME, EMAIL)
VALUES (?, ?, ?)
ON CONFLICT ([*]TOKEN, NAME) -- line 4
DO UPDATE SET EMAIL = EXCLUDED.EMAIL;

-- expected "DO";
-- SQL statement:
insert into public.my_table (token, name, email)
values (?, ?, ?)
on conflict (token, name)
do update set email = excluded.email;

-- [42001-200]

Here is what happens if I am switching dialect from SQLDialect.POSTGRES to SQLDialect.H2:

-- Column "EXCLUDED.EMAIL" not found; SQL statement:
merge into public.my_table using (select 1 one)
on (public.my_table.token = cast(? as varchar) and public.my_table.name = cast(? as varchar))
when matched then update set public.my_table.email = excluded.email
when not matched then insert (token, name, email)
values (cast(? as varchar), cast(? as varchar), cast(? as varchar))

-- [42122-200]