Switch to Custom Date Format or Time Format reset to default and date_i18n

[axewww]

Anyone else experience that if you go on WP admin -> Settings -> General
and try to save Date Format or Time Format to Custom, it do not change/update nothing on saving but reset to the previous setting?

Also, i try to use

<?php
date_i18n( 'H:i Y-m-d', $value->topic_last_post_time )

passing a timestamp, that return ever the same, whatever i can change the timezone setting. Maybe on this i've not understand something, but about the above, i'm not the only one experiencing this behavior about Custom setting for Date Format or Time Format.

Thank you!

Any idea?

[axewww]

Hello boys, sorry there is an answer that have clarify all about, so this is not to be considered as a bug.
​https://wordpress.org/support/topic/saving-date-format-or-time-format-not-update/#post-8887077

Thank you