the note in removed tag still affects the following pitch

[Jinsong Zhao]

Hi there,

In the following snippet, \removeWithTag #'b have a different effect 
with commenting the line of \tag #'b. It seems that the pitch after \tag 
#'b also affected by the removed tagged expression.

\version "2.19.15"

music = \relative c'' {
  \clef "treble"
  \key ees \major
  \time 4/4
  \tempo 4 = 90
    ees4 ees'2.
         \tag #'b {aes'2.}
    ees,4 ees'2.
    aes,1
}

\new Voice {
  \removeWithTag #'b
  \music
}

Any suggestion or comment will be really appreciated.

Best regards,
Jinsong