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How to diagnose and report a bug

Hi, I've found this bug consistently on debian testing (updated):

Steps to reproduce:
In pcmanfm's address bar, type:
Write password, Enter.
Navigate to the remote machine user's folder.
Open, edit and save a plain text file with leafpad.

The file gets blanked (no content at all).

Mounting the remote machine with sshfs, and doing the next steps
identically, works fine.

pcmanfm  1.3.0-1
ssh            1:7.7p1-2

Any recomendations on how to diagnose and report this bug?

Thanks a lot.