tie & tag

[Gianmaria Lari]

I would expect this code

\version "2.21.00"
test = {\tag #'first c'
        \tag #'second e'}
\keepWithTag #'first {\test~\test}
\keepWithTag #'second {\test~\test}

... generates two scores

c~c

and

e~e

but it doesn't! It generates

c c

and 

e~e

Why no ties in the first score? Any "fix"?

Thank you, g.