Drop-down list in custmize info

I used to use “<“b r >” to change line in the drop-down list. (Please ignore the ")

such as :
aaaa
bbbb
cccc
dddd

I can have option to put
aaaa
bbbb

in the option.

But after I update to the latest version. I can’t change line by
.

Is there any other method can change line?

I also tried <”br /> (Please ignore the ")
\n
</br“>

none of them working.

What custom field are you referring to?

Line custom fields can not use a drop-down list

Elsewhere they work as expected

In a regular custom field (not line-item), that has never been necessary. See @Joe91’s first screen shot.