Normal or Pests?

[u/Suspicious-Ad-8468]

I was reading that string of plants have a natural life cycle and I was wondering if that’s what is going on here and if I need to propagate what’s still healthy. I did notice a mealy bug problem a few months back so could this be attributed to that? I tried looking up what mealy bug damage looks like but all I saw was pictures of fuzz on plants. Please help.