matrix block duplication - change when we set canonicalId

[i-just]

Description

When adding the owner element to a new site, don’t propagate matrix blocks to that new site if the field’s propagation method disallows it.

With the following setup:

• (at least) 2 sites
• matrix field with propagation: none (“Only save blocks to the site they were created in”)
• section enabled for both sites with the above matrix field and propagation: custom (“Let each entry choose which sites it should be saved to”)

Create an entry on site 1, add at least one block to the matrix field and save.
Add the entry to site 2 and, without saving (while still editing a provisional draft), switch to the entry for site 2.
You shouldn’t see the matrix blocks from site 1 once you switch to site 2.

Related issues

https://app.frontapp.com/open/msg_ukaoki1?key=U6zkE_S6_ApMXn3ntPMwUxSLe0sUPsmY