Error when creating a materialized view with TUMBLE and offset

[maxjoh]

Describe the bug

It's not possible to create a materialized view using TUMBLE() with an offset, as shown below.

Error message/log

SQL Error [XX000]: ERROR: Panicked when handling the request: assertion `left == right` failed
  left: 3
 right: 2
This is a bug. We would appreciate a bug report at:
  https://github.com/risingwavelabs/risingwave/issues/new?labels=type%2Fbug&template=bug_report.yml

Error position:

To Reproduce

create materialized view if not exists "tumble_with_offset" 
as ( 
  with
    input as (
        select 1 as id, TO_TIMESTAMP('2024-01-01 01:30:02', 'YYYY-MM-DD HH24:MI:SS') as timestamps
    )
    select *
    from tumble(input, timestamps, interval '1 DAY', '+6 HOURS') -- if you omit the '+6 HOURS' offset, it works
    )

Expected behavior

A materialized view should be created

How did you deploy RisingWave?

RisingWave Cloud

The version of RisingWave

dev=> select version();
                                  version
----------------------------------------------------------------------------
 PostgreSQL 9.5-RisingWave-1.5.1 (aa67e4728fdae80f31970ee96307683cd4ccf4c9)
(1 row)

Additional context

No response