Bridge to UE4 Plugin: automatic map assignment / custom names do not work properly

We followed the setup guide for exporting channel packed maps.

Our goal is to export the maps directly to our own Master Material.

It exports the ARM-map and also recognizes it as a needed input (import Master Material Textures is checked) but the BC-map (Albedo) does not get imported at all.

The ARM-map does not get assigned automatically.

If I cange the master-materials parameter name from BC to Albedo. The BC-map gets exported and assigned.

So it seems, custom names for the maps do not seem to work all to the end.

Here is the log file. But it seems to be file:

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{"level":"info","message":"The image processor executable path is: D:\\Library\\Quixel\\support\\utils\\ImageProcessor\\ImageProcessor","timestamp":"2020-06-26T07:50:46.390Z"}
{"level":"info","message":"The json data parent directory path is: D:\\Library\\Quixel\\support\\utils\\ImageProcessor\\bridgeData","timestamp":"2020-06-26T07:50:46.391Z"}
{"level":"info","message":"Writing JSON file to D:\\Library\\Quixel\\support\\utils\\ImageProcessor\\bridgeData\\DataForIP1.json","timestamp":"2020-06-26T07:50:46.400Z"}
{"level":"info","message":"JSON written to folder","timestamp":"2020-06-26T07:50:46.416Z"}
{"level":"info","message":"Sending all files to channel packer for format/resolution conversion.","timestamp":"2020-06-26T07:50:48.024Z"}
{"level":"info","message":"All files converted to right format and resolution and are ready to be exported.","timestamp":"2020-06-26T07:50:48.034Z"}
{"level":"info","message":"assets to export = 1","timestamp":"2020-06-26T07:50:48.072Z"}
{"level":"info","message":"Sending data over socket. Host = 127.0.0.1, Port = 13429","timestamp":"2020-06-26T07:50:48.087Z"}
{"level":"info","message":"Connected 13429","timestamp":"2020-06-26T07:50:48.459Z"}
{"level":"info","message":"Data sent over port 13429","timestamp":"2020-06-26T07:50:48.459Z"}
{"level":"info","message":"Exported 1 Assets Successfully","timestamp":"2020-06-26T07:50:48.459Z"}