The AurorasDecorations mod adds copper sulfate, which can be used to craft various light source variants including torches and lanterns. As such, Blockus should add a copper sulfate lantern block with a green color.

There will be a Copper Lantern Block for 1.21.9 Blockus update because they add the copper lantern in Vanilla.
And I suppose I can close this since I no longer plan to update Blockus 1.20.1