again struggling with simultanous / stacking voices

[Sebastian Menge]

Hi

I have a (organ) piece with different "voices"(?) stacking up to chords.

Since this is rather homophonic, I'd not use individual voices - the slurs
look ugly then.

I came up with the following (hardly minimal) example. Lily gives me many
warnings, so I wonder if I could make it better - and easier.

Btw: replacing the "r2" with "s2" in the beginning improves things
technically (less warnings), but with the "rest" engraved, the output looks
better to me.

I have the feeling I miss / don't understand something conceptually. I
would like to understand why lily refuses to engrave the slur of the first
fis.

Thanks Sebastian.

\version "2.24.3"

\relative c' {
   \key b \major
    << {fis1 ~ fis ~ fis ~ fis e fis ~
      \time 3/4 fis2. ~ fis ~ fis ~ \time 4/4 fis2 eis}
     {r2 a2 ~ a1 ais gis ~ gis a
      gis2. ~ gis ais gis1}
     {s1 c1 cis b ais b ~
      b2. ~ b s2. s1}
  >>
 }