What is the difference between 'Eloquent Collection' and 'Support Collection' when using 'InteractsWithPivotTable::sync()' ?

[pronist]

I am trying to use InteractsWithPivotTable::sync() with Support Collection. I met Column not found: 1054 Unknown column error. but, When I use Eloquent Collection with Model::get(), it's successful to insert records. What is the difference between 'Eloquent Collection' and 'Support Collection' when using InteractsWithPivotTable::sync() ?

in Laravel 8

use Illuminate\Support\Collection;
use App\Models\Post;
use App\Models\Tag;

$post = Post::find(1);

// Case 1. Eloquent Collection

$tags = Tag::limit(2)->get();

$post->tags()->sync( $tags ); // OK

// Case 2. Support Collection

$tags = collect();
$tags->add( Tag::find(1) );
$tags->add( Tag::find(2) );

$post->tags()->sync( $tags ); // Column not found: 1054 Unknown column ...