*add calls to this.syncState?.() which may be dynamically set higher in the stack to sync the state of the channels and messages

index.js

@@ -81,6 +81,7 @@ class Channel {
     if (this._handshake) this._handshake.encode(state, handshake);
 
     this._mux._write0(state.buffer);
+    this.syncState?.();
   }
 
   _dec() {
@@ -95,6 +96,7 @@ class Channel {
   _fullyOpenSoon() {
     this._mux._remote[this._remoteId - 1].session = this;
     queueTick(this._fullyOpen.bind(this));
+    this.syncState?.();
   }
 
   _fullyOpen() {
@@ -152,6 +154,7 @@ class Channel {
     this._track(this.onclose(isRemote, this));
 
     if (this._active === 0) this._destroy();
+    this.syncState?.();
   }
 
   _destroy() {
@@ -509,6 +512,7 @@ module.exports = class Protomux {
       return;
     }
 
+    this.syncState?.();
     r.session._recv(type, state);
   }
 
@@ -530,6 +534,8 @@ module.exports = class Protomux {
         this._onclosesession(state);
         break;
     }
+
+    this.syncState?.();
   }
 
   _bufferMessage(r, type, { buffer, start, end }) {