Event data is not being written into Variable

I have a strange problem,

Here you see I have some event data from Data Tag.

cookie.fbc → fb.1.1732202300997.234bcd"
cookie.fbp → fb.1.1732202300999.263870090446897108"

now, I have set up two event data variables, to access those values, as I have done this a lot:

When I now go to variables, they are undefined:

How is that possible? The Container is published, of course.

Cheers and thanks in advance!

It looks weird, probably just a preview glitch.
Or maybe you are using some kind of transformation?
In general you usually don’t need to pass cookies to the server in event data, you can have them available on the server using the ‘Cookie Value’ variable.

None. Just very standard Data Tag.

Yeah I know, but it also happens to other event data. E.g. attribution.utm_campaign

Then I’m pretty sure it’s a preview mode glitch. Try incognito mode or clearing cache/cookies.