Tied \afterGrace notes don't work?

[Dominic]

/\version "2.19.15"
\new Voice {
        \afterGrace R1 { g''8~ } | 1
}/

results in 'warning: unterminated tie' and no tie printed. (Slurring the two
notes, on the other hand, works fine)
Is this a limitation, and if so, what would be a workaround to produce a
visually and functionally identical result?

Thanks,

Dominic



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