Custom lookup attribute in Modern/New UX will only show 25 values and not have infinite scrolling
STEPS TO REPRODUCE:
Expected Results: To be able to scroll with infinite scrolling (indefinitely)
Actual Results: Only 25 values are displayed and no way to scroll more
Workaround: None if you would like to pick a value out of all of them. Only if you know what to pick you could type to select the value
Release : 15.7.1, 15.8
DE54139, Not a Bug in 15.8 This is a current limitation with static lookups in the Modern UX. We are looking at re-factoring the lookup widget to enhance the static lookup display but we have not schedule for a future release at this time.
Reviewed and tested in Release 16.1.3 - This behavior has changed.