I use different Linux distributions. And everywhere the same behavior.
When copied, this character remains as it is. That is the symbol ␉. Not the tab character - 0x09
It doesn't change whether I mount and view the results in a text console or in kconsole.
At the same time, if I use, for example, ocamlGdrive (another library), everything is displayed as expected. That is, the tab character is exactly that character without replacement.
That is, it is connected precisely with the behavior of rclone. Not the behavior of the system.