vim: surround plug bug

I believe this is easy to reproduce:

test string 1. hi hello world.
test string 2. hi hello world .

I want to surround hello world (generating -> hi "hello world").
using surround.vim plugin, if my cursor is within hello, but not on h,
the provided method is as following:
ys2aw"

if my cursor is on 'h' in hello, then this also works:
ys2w"

the first method save a move (b key) but does not work for test
string1, but works well for test string 2. I think this might be a
bug...


regards

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