when snip list appear, the first snip is auto selected. if I input "enter", the first snip is not being expanded

[aizhiqi]

Expected behavior:
let g:UltiSnipsExpandTrigger = "< cr >"

when snip list appear, no snip is been selected.

Actual behavior:
let g:UltiSnipsExpandTrigger = "< cr >"

when snip list appear, the first snip is auto selected. but if I input "enter", the first snip is not being expanded

Steps to reproduce
1.insert follow line to config:
let g:UltiSnipsExpandTrigger = " < cr > "

2.vim test.py

3.input:"de"

4.vim auto triger snip list and the first line is seleced

5.input "enter", but the first snip is not being expanded

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• Operating System:
• Vim Version:
• UltiSnips Version:
• Python inside Vim:
• Docker repo/vimrc: