"Assertion failed" when entering Windows-style path name into remote path field

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Steps to reproduce:

1. Connect to a Linux-based server
2. Type a Windows-style path name like "D:\temp" (no quotes) into the *remote* site directory and press <ENTER>.
3. This causes FileZilla to display a modal dialog with the following message:

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Assertion failed!

Program C:\Program Files (x86)\FileZilla FTP Client\filezilla.exe
File: ../../../../packages/FileZilla3/src/engine/local_path.cpp, Line 359

Expression: segment.find(L "\ \" )== std::wstring::npos

[I had to munge the above string, otherwise it broke this bug tracking input field; the part in parens should be the following chars: el,quote,backslash,backslash,quote. See attached screenshot.]

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I am running the latest FileZilla for Windows: 3.47.2.1 (see system info below):

FileZilla Client

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Version: 3.47.2.1

Build information:

Compiled for: x86_64-w64-mingw32
Compiled on: x86_64-pc-linux-gnu
Build date: 2020-03-11
Compiled with: x86_64-w64-mingw32-gcc (GCC) 8.3-win32 20190406
Compiler flags: -g -O2 -Wall

Linked against:

wxWidgets: 3.0.5
SQLite: 3.31.1
GnuTLS: 3.6.12

Operating system:

Name: Windows 7 (build 7601, Service Pack 1), 64-bit edition
Version: 6.1
Platform: 64-bit system
CPU features: sse sse2 sse3 ssse3 sse4.1 sse4.2 avx aes pclmulqdq lm
Settings dir: C:\Users\[redacted]\AppData\Roaming\FileZilla\

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Modal error dialog