Tempo marking doesn't avoid cross-staff slur

[Knute Snortum]

I found a weird behavior -- I don't know if it's worthy of an issue or not,
but here it is:

The tempo marking will not avoid a slur that goes from staff to staff.
Here is a snippet that shows the problem, and I've attached an image of it:

\version "2.25.12"

one = \relative {
  \tempo "Allegro maestoso"
  c'''2( e |
  \change Staff = "lower" c,1) |
}

two = \relative {
  s1 |
  s1 |
}

<<
  \new Staff = "upper" \one
  \new Staff = "lower" \two
>>

--
Knute Snortum