TCA is causing entities to be save twice

Problem/Motivation

TCA is causing entities to be save twice

Steps to reproduce

Enable TCA and implement a simple hook_entity_presave for debugging.

function mymodule_node_presave(NodeInterface $node) {
  dump('nid: ' . $node->id());
}

Create a new node. You'll see the hook is called twice.

Proposed resolution

See attached patch.