Can't delete char before the cursor when RE-in INSERT mode

Hi guys,

Do you see this bug: chars before cursor can't be deleted when you switch into INSERT mode from NORMAL (by pressing `i`, `A`, `a`, `s` or `c`)

I have tried <delete>, <c-h>, <c-w> and <c-u>, none of these keys worked.

I thought it was a bug of my vimrc or plugins I installed, so I commented the vimrc and relaunch vim without loading any third-party plugin, BUT the bug wasn't gone.

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