WK made some under-the-hood changes to the way the lesson screen works, which breaks several scripts. I have been working on a fix, but it’s not quite finished yet. For now, you can either test my fixed version:
or you can enable the script compatibility mode in the WK settings.
UPDATE: My pull requests for Keisei, Niai, and Rendaku information were all accepted, so the official installation link in the OP now again provides the most up-to-date version. To make sure that nobody accidentally installs the now outdated versions that were linked above, I changed the link targets to point to the official install locations. Please report any bugs – especially with the compatibility mode disabled – so that I can fix them before the WK team removes the compatibility mode.