FFS 12.4 Win hangs while searching files on distant server running on Azure

[cicebear]

I don't know if it is a problem with the Azure.
I started a new mirroring of files from a Windows server to a server running on Azure and everything ran fine. At this time, there were no files on the distant server. Than, I have to interrupt the progress. Later I started it new from a different computer. Searching for the files on the local computer was without problems, but during the search on this distant server, it hangs. I deleted the folder where it hung on the distant server, because I assumed that the folder/file itself was the problem. But now it hangs on the next file (at 1.042.377 files). It does not react to the Cancel button, so I had to kill it.

Edit: when I install FFS on the Azure server and pull the files instead of push, it works fine!