Thumbnails not being created w/ official Docker container

The thumbnails aren’t generated, and aren’t displayed for anything.

I’m crawling a smb1 share, and the files are crawled correctly - they can be searched just fine.
The thumbnailer is running ‘correctly’, reporting absolutely no errors. Here’s an excerpt from the fess-thumbnailer.log:

2021-08-26 13:02:01,457 [pool-6-thread-1] INFO  Generating Thumbnail: smb1://redacted.local/data/PROJECTS/redacted/Thermistor connector popravek3.docx
2021-08-26 13:02:01,457 [pool-6-thread-1] INFO  Generating Thumbnail: smb1://redacted.local/data/PROJECTS/redacted/Thermistor connector.docx

Thousands of such lines, not a single error.

However, when you go to /var/lib/fess/thumbnails, there is a huge directory hierarchy, but zero files in those directories: find /var/lib/fess/thumbnails -type f 2>/dev/null | wc -l returns 0.
If you watch 'find /var/lib/fess/thumbnails -type d 2>/dev/null | wc -l', you can see that the number of directories is ever increasing, but no files are created.

I’m using the latest docker images: ghcr.io/codelibs/fess:13.14.0 and ghcr.io/codelibs/fess-elasticsearch:7.14.0, running in podman=3.3.0-dev on Centos Stream.

It will be fixed in the next release.