select component in the form : the first character entered doesn't select/highlight  the first correspondence in the list

The "matching as you typing" feature is slightly changed in 17.1    

Service Catalog 17.1   with rollup1 patch applied 

In 14.1 ,  it matches with the word which starts with the characters you typed  in select dropdown field 

In 17.1 ,   it matches with the word which contains  the  characters you typed  in select dropdown field  . 

For example ,  see the following screenshots:

When we type s, it is showing all records which contains  's' :

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