https://bugs.winehq.org/show_bug.cgi?id=57468
--- Comment #5 from Eric Pouech eric.pouech@gmail.com --- Thanks for the details
part of this issue is what's described in https://bugs.winehq.org/show_bug.cgi?id=49780 (missing support for various escape sequences)
but I would have expected (as you tried) that PS1='' fully fixes it, which it doesn't so there's likely something else can you post the output with WINEDEBUG=+console?
TIA