Duplicate page with block set up in composer

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Hi

I have a little (ok, big) problem with C5. I've created page type named PT (installed from own theme).
After that I went to Dashboard -> Page Types -> Defaults -> Edit and added new Content Block. After added I set this block into Composer (Composer Setting -> Include block in Composer).
Next step was turn on page type in composer (I did this).

My problem:
1. Create new page (in PT type)
2. Go to Full site map
3. Copy page (by drag & drop
4. Edit this block in composer
I can't see anything in page and I can't edit in composer.

IceManSpy