fix: fix SSR of sbb-select (#2341)

src/components/core/dom/breakpoint.ts

@@ -12,7 +12,7 @@ export type Breakpoint = 'zero' | 'micro' | 'small' | 'medium' | 'wide' | 'large
  */
 export function isBreakpoint(from?: Breakpoint, to?: Breakpoint): boolean {
   if (!isBrowser()) {
-    // TODO: Maybe find better default solution for SSR?
+    // TODO: Remove and decide case by case what should be done on consuming end
     return false;
   }
 

src/components/select/select.ts

@@ -239,7 +239,7 @@ export class SbbSelectElement extends UpdateScheduler(LitElement) {
 
     // Wait for ssr hydration
     this.startUpdate();
-    if (!isNextjs() || !this.hasAttribute('defer-hydration')) {
+    if (!isNextjs()) {
       this._setupSelect();
     }
   }
@@ -256,7 +256,7 @@ export class SbbSelectElement extends UpdateScheduler(LitElement) {
     // which is done after hydration is finished. Due to this we intercept this call
     // in overriding removeAttribute to finish initialization of the sbb-select.
     // https://github.com/lit/lit/blob/main/packages/react/src/create-component.ts#L293-L296
-    if (isNextjs() && qualifiedName === 'defer-hydration' && this.hasUpdated) {
+    if (isNextjs() && qualifiedName === 'defer-hydration' && !this._didLoad) {
       this._setupSelect();
     }
     super.removeAttribute(qualifiedName);

src/react/core/ssr-extensions.ts

@@ -32,6 +32,7 @@ export const withSsrDataSlotNames = <P extends object>(
         Children.forEach(props.children, (child) =>
           slots.add(
             (typeof child === 'object' &&
+              !!child &&
               'props' in child &&
               'slot' in child.props &&
               child.props.slot) ||