ONLYoffice download and file download difference

I am running v. 20.0 but I know this problem was in older versions also.
I am running the ‘internal’ ONLYOffice app v. 6.0.2 and Community Document Server 0.1.8.

When I open a document in ONLYOffice and maken some changes all changes are written to Nextcloud.
Then I want to download the document from ONLYOffice (File -> Download as -> I choose docx dowload) and all alterations are okay.
When I download the document from the file list in Nextcloud, the older version is presented.
Although ONLYOffice has saved all alterations, the modified time in the file list is not altered.

What am I doing wrong?

Any help welcome!