pxt-arcade: blockly function names disappearing (cannot open game "unfroggable")

This game: https://makecode.com/_Rq9cppgu5XHD

does not load. Instead there is a blank screen and these errors in the console:

simulating script
pxtembed.js:100154 upgrading dep tilemaps: github:microsoft/pxt-tilemaps#v1.7.1 -> github:microsoft/pxt-tilemaps#v1.8.1
pxtembed.js:100154 upgraded, downloading again
2pxtembed.js:170057 A namespace declaration cannot be in a different file from a class or function with which it is merged.
(anonymous) @ pxtembed.js:170057
pxtembed.js:170098 Diagnostics Array(2)
0: category: 1code: 2433column: 10fileName: "pxt_modules/tilemaps/overworld.ts"length: 7line: 33messageText: "A namespace declaration cannot be in a different file from a class or function with which it is merged."start: 885__proto__: Object
1: category: 1code: 2433column: 10fileName: "pxt_modules/tilemaps/tilemap.ts"length: 7line: 6messageText: "A namespace declaration cannot be in a different file from a class or function with which it is merged."start: 190__proto__: Objectlength: 2__proto__: Array(0)
(anonymous) @ pxtembed.js:170098
--run:212 simulator started...