[TYPO3-Solr] Indexing files "attached" to a record

[Peter Beernink]

Hi,

I've setup indexing for an Extbase table which includes a "file" field.
As I also want to index the contents of that file, I've added it to the 
'index.queue.<key>.attachments.fields=file.
However this doesn't get picked up.
When debugging I found that instead of using the key.table, the key is 
used to check for the TCA array.
When I changed my configuration to have the key match the tablename it 
still didn't work.
after some further debugging it looks like the 
fileindexer_attachmentdetectorfactory doesn't load the full TCA, as I 
only have the ext_tables.php part.
The strange thing is that tt_news does work.

Does anyone have an idea what might be causing this?
It this a bug and is tt_news working by accident or am I missing some 
configuration?

Greets,
Peter