Bat Skin Template errors when trying to convert to a different format

[ewanhowell5195]

What are you trying to do, and what do you expect to happen?

Load a bat template model from the skin format. Try converting it into another format.

What happens instead?

It errors

Uncaught SyntaxError: "undefined" is not valid JSON
    at JSON.parse (<anonymous>)
    at codec.rebuild (skin.js:163:19)
    at Codec.parse (bbmodel.js:322:22)
    at Dialog.onConfirm (project.js:1137:22)
    at Dialog.close (dialog.js:708:22)
    at HTMLButtonElement.<anonymous> (dialog.js:796:11)
codec.rebuild @ skin.js:163
parse         @ bbmodel.js:322
onConfirm     @ project.js:1137
close         @ dialog.js:708
(anonymous)   @ dialog.js:796

Model format in which the issue occurs

Minecraft Skin

Blockbench variant

Website, PWA, Program

Blockbench version

4.9.4

Operating System

Windows

Installed Blockbench plugins

No response