Tags disappear when selecting next then previous

[manontheresa]

Describe the bug
If I'm on the tags step, click next, and then previous all of my tags are gone. Also, I can click on the next steps without filling them out - just tap on the number below (f.e. from 2 -> 3) and experience the "magic".

To Reproduce
Steps to reproduce the behavior:

1. Go to Add new Project
2. Click on Manual / Github / Gitlink
3. Click Step 2 then Step 3 (related to other comment)
4. Fill out something in tags
5. Click next
6. Click previous
7. Tags are gone

Expected behavior
I expected that it would memorize the errors