java.time.LocalDateTime in Oracle gets rounded to just 3 digits

Having a column like
 

    @NotNull
    @Column(name = "awayUntil", nullable = false)
    private LocalDateTime awayUntil;

which we set to

awayUntil = LocalDate.of(2021, 4, 8).atTime(LocalTime.MAX);

gets somehow rounded to 2021-4-9 00:00:00,000000 after persisting into the Oracle DB.

The type of the column in Oracle is Timestamp(6).