Supabase: Updated Row Doesn't Send in Passing Parameter

1. I have the page Entry with page parameter entryRow (Supabase Row)

2. I have a form to update this entry.
   Action logic for button "Update".
   a) I use Action Output Variable to send updating row to page Entry.

b. I send first item from Action Output Variable

3. Result:
   It is empty.
   I Checked URL
   There is no ?entryRow={//JSON document of updating row} in URL. This parameter doesn't exist.
   
   But if I send new row in Action Output Variable then it works.
   For Insert row Action Output Variable has type Row and
   For Update row Action Output Variable has type List of Rows.
   
   Where is the mistake?
   Thanks.