4
You will need to check if the $node variable is actually an instance of node object.
if ($node instanceof \Drupal\node\NodeInterface) {
// You can get nid and anything else you need from the node object.
$nid = $node->id();
}
See
How do I get the current node ID?
1
Use [current-page:query:foo] in Default Value field and set query string to node/1?foo=1,2 and it will work.
Installing Tokens module will show you some values you can use in your default value field.
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