UX: Sending request process cancelled unexpecedly when selecting agency, which is not public yet? (Plus mode)

[rugk]

STR

0. Have plus mode on FragDenStaat enabled, i.e. the one, where you can do multi-requests.
1. E.g. select https://fragdenstaat.de/behoerde/14714/ministerium-fur-verkehr-des-landes-nordrhein-westfalen/ ( I guess this is a problematic one?); Or I also had the case, where I selected a non-approved agency.
2. Go to the next page.
3. Fill in your request with all details.
4. Proceed to send it…

What happens

You get a quite generic error like this:

Ihre Formulareingabe enthielt Fehler. Bitte überprüfen Sie Ihre Eingabe und senden Sie das Formular noch einmal.

translated:

Your form entry contained errors. Please check your input and send the form again.

And you get redirected to the agency select page with all agencies being cleared, which is quite scary and causes my heart to stagger.
Thankfully, your form content stays there, so you can "recover" from this.

What should happen

Not let me select the agency in the first place?
Either filter it directly or show an error/warning directly when I select it, so I can refrain from it.