A new version of the Chess Game Viewer (1.1.6) has been published. If you host your own version of the Chess Game Viewer you may want to update it. Otherwise no action is needed. The new version solves a bug related to the code generation of promotion, as indicated in the comments on the Chess Game and Diagram Viewer.

The code generation is still not very robust and only intended for simple games, but there are some workaround to make things working. To be sure you are advised to use the coded moves generated by PalView. It's still more a viewer than a code generator.