FXP does not copy the dates of files copied from the left panel to the right.
ESSENCE OF THE PROBLEM
TC ALWAYS sends a time modification command to the server that is open on the left panel, even when it is the source, not the recipient
This should be fixed now, please try with the latest beta (4 or newer).
05.11.19 Fixed: FTP direct server to server transfers (FxP): Copying the timestamp could fail because it was sent to the wrong server (32/64)