Decrease in SgNB addition after disabling ULI (Upper Layer Indicator) in 5G NSA

Hello Experts.
In our NSA network, after disabling ULI (upper layer indicator) we got decrease in SgNB addition.
Any explanation for this?

It is not expected.
But why did you disabled that?

It’s only used to indicate 5G icon.

We need to show 5G logo only wherever we have 5G coverage.