Very bad bug in 3,5,5

Hi,
I just lost an important document by the help of WinSCP in Version 3.5.5
Don't double-click, change something, close the application and then cancel the following automatic upload of the changes - because then everything ist deleted including the original...
I hope this issue is already fixed, I just downloaded the recent version.
Chr

Nothing has changed. Noone else has ever compained. BTW, what have you expected to happen, what you did it?