Trouble with first save new page.

I create a new page automatically opens page editor and if i click to save button CMS tries to redirects me into this page. The page creats after this action but doesn't save content, so that shows error. I click the back button, returns to the page editor back, fill the page again and click the save button again - everything saves. Can you tell me what's wrong, please?
I'm sorry for my bad English.

Start by reproducing the automatic new-page flow in the Grav Admin Plugin and inspect how the first save redirects and creates the page. The issue is resolved when the initial save preserves the entered content and does not show an error or require returning to the editor.

Written by the indexing model from the issue text.