I have split up my data into a static part and a dynamic part. The static part are all the documents, pictures and other data I have. No .dot files in there. Resides on a SSD and is decrypted and mounted to /mnt/HomeDaten during bootup. fstab entry is:

/dev/mapper/homedata_crypt	/mnt/HomeDaten	ext4	defaults	0	2

The folders on this drive are the ones used by xdg.

All .dot files reside in the normal /home/$USER folder. /home is on a separate drive, also luks encrypted. fstab entry is:

I am using symbolic links to get access to the folders on the static drive. Typical command (in German):

ln -s /mnt/HomeDaten/$USER/Dokumente /home/$USER/Dokumente 

Problem:
In most folders I cannot move deleted files into the trashcan where I have the chance to review/undo the deletion. I must immediately delete any file. This is not only limited to the linked folders, I seem to have a partial problem in my /home too. Not everywhere. I haven't fully understood the systematics behind the behaviour yet. I played around and copied some empty trashcans on my HomeDaten folder and into the individual folders I have linked. No succes.

What is the reason and what can I do to fix the problem (keeping the setup)?