Plugin plover excel dictionary doesn't work on Plover dev12

[ossossosso]

I've update Plover from "plover-4.0.0.dev11+23.g991d334-win64" to "plover-4.0.0.dev12+18.ge651627-win64".

I've reinstalled the plugin "plover_excel_dictionary", that worked on dev11, but it doesn't on dev12.

The dictionary with ".xlsx" extension correctly appears into the dictionary stack in Plover, but there is this error message:
"errored: 'set' object is not subscriptable."

It looks a known issue with one of the plugin requirements:
pyexcel/pyexcel-xlsx#52

It seems to work if downgrade the problematic package:

plover_console.exe -s plover_plugins install "openpyxl==3.0.10"