I created a new post and uploaded two images. I wanted to see what it looked like, so I clicked Preview. The images showed as a "broken image" icon and I got 60 errors of the form:
Type of error: General
2: fopen(/home/example/public_html/attachments/3427_9a6b7f4002bc968e7de0f0949679549bf1fac129.dat): failed to open stream: No such file or directory
https://forums.example.com/index.php?board=21;action=post2
/home/example/public_html/Sources/Subs-Graphics.php (Line 348)
When I posted the topic, it was fine. This is 2.1RC2
I can confirm (using postgres). I never reported it because I assumed this was expected behavior due to some technical reason. [Edit: However, I never got an Error Log entry; might be another Postgres issue]
I can also say that this is fixed in yesterday's nightly (2019-09-19). :)