Can't import a map if any objects have \n in a custom property

[TeamRobostar]

Plugin version
Plugin 2.3, from GitHub.
Godot 3.2.3
Tiled 1.4.3

Issue description
If an object in the map has a custom property containing the newline escape character \n, the map fails to import with the following errors:
Missing information in custom properties (around line 0).
res://addons/vnen.tiled_importer/tiled_xml_to_dict.gd:111 - Invalid get index 'properties' (on base: 'int').
Tiled Importer: Error parsing map file 'res://Assets/Maps/Example.tmx'.
editor/editor_file_system.cpp:1801 - Error importing 'res://Assets/Maps/Example.tmx'.

Steps to reproduce
Open a map in Tiled; create an object with a custom property and set it to "Hello\nWorld".

Sample map or tileset

Example.zip

[Bauxitedev]

Running into the same issue here. Trying to switch to JSON instead of XML map file format didn't work either, because somehow custom properties don't even seem to be read at all if the map is in JSON format?