LG SDQHD - 28mq780: 1280x1440 resolution does not work

[chlrhkd4]

My device:

2019 Intel Mac with AMD Radeon Pro 5500M
OS: Tahoe 26.3

Issue:
1280x1440 (which is 2x resolution of 2560x2880) is not working.
When I select that resolution, better display tool is not respond and keep using previous resolution.
Actually, it looks under or equal 1280 is not working. 1296x1458 is working.

Video:
https://drive.google.com/open?id=16F7v9pF9dFJlkmR5DF0SXIYGowRca4Zi&usp=drive_fs

Could you please help to resolve it?

Thanks!