Sharing API behaves unexpected

[nickvergessen]

Regression most likely from #49898

• Create a share with a user
• Check mail_send in the response
• Check mail_send as recipient for the same share

Expected

The field matches 🔢

Actual

The field has different values 💥

cc Authors and approvers: @miaulalala @artonge @nfebe @provokateurin