Localized entry has default/main sites parent entry

[vanhooff]

Bug Description

When trying to save a translated entry on multisite installation. The following error pops up: https://prnt.sc/tta3w2
The page id shown in the error is the parent entry of the main language. By default, parent is readonly, so I cannot save.

How to Reproduce

1. Create translation on multisite entry
2. edit some content and save

Environment

Statamic version: 3.0.0.-beta-42

PHP version: 7.4

Install method (choose one):

• Fresh install from statamic/statamic

[vanhooff]

Closing this issue as it is a duplicate of #2176