DateRange Picker doesn`t apply styles with minMode 'month'

[SofiiaPopadiuk]

Bug description:

When we open DateRange Picker with minMode 'month' and select 2 moth, we will not see the range styles on month between as we see on days range:

It is reproducible in the library documentation

Versions:

ngx-bootstrap: 20.0.2

Angular: 20

Bootstrap: 4.4.1

Expected behavior

Have the same styles as on days picker