fix: preserve predecessors sharing a state-before ID

Signed-off-by: Erwan Leboucher <erwanleboucher@gmail.com>

Cargo.lock

@@ -1122,6 +1122,7 @@ dependencies = [
  "lru-cache",
  "nonzero_ext",
  "openidconnect",
+ "opentelemetry",
  "p256 0.14.0",
  "rand 0.10.3",
  "regex",
@@ -1130,6 +1131,7 @@ dependencies = [
  "resolvematrix",
  "ruma",
  "ruminuwuity",
+ "rustls",
  "rustyline-async",
  "sd-notify",
  "serde",