Full Text Search German Date

I encountered a problem I don't understand.

I create a tsvector (in a column named "search") from document files, 
which contain a German date. When I select the column, I can see it has 
been tokenized:

'25.05.2025':56,99 (plus many other tokens)

but
SELECT id FROM documents WHERE
search @@ to_tsquery('german', '25.05.2025')

gives no result.

But this query returns true:
select to_tsvector('german', 'bla baum haus 25.05.2025 blub fahrrad')
@@ to_tsquery('german', '25.05.2025')

And also the following query returns true:
select '25.05.2025:1 blub:2'::tsvector @@ to_tsquery('german', '25.05.2025')

Can someone explain me, why my query on the database fails?