Unnecessary warnng messages?

LilyPond 2.26.0 renders the follwing code fine but also produces =
unnecessary(?) warning messages.

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=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=
=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=
=80=94=E2=80=94
\version "2.26.0"

\language "nederlands"

\new Staff {
  \relative c' {
    \key es \major \time 4/4 <<g4 es'4 es'2~>> es8 r8 r4
  }
}
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=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=
=80=94=E2=80=94
Starting lilypond 2.26.0 [test.ly]...
Processing `/Users/me/Documents/LilyPond/test.ly'
Parsing...
Interpreting music...
/Users/me/Documents/LilyPond/test.ly:7:44 <0>: warning: unterminated tie
    \key es \major \time 4/4 <<g4 es'4 es'2
                                           ~>> es8 r8 r4
/Users/me/Documents/LilyPond/test.ly:7:44 <1>: warning: unterminated tie
    \key es \major \time 4/4 <<g4 es'4 es'2
                                           ~>> es8 r8 r4
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Converting to `test.pdf'...
Success: compilation successfully completed
Completed successfully in 1.7".
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=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=
=80=94=E2=80=94
=EF=BF=BC