Web app freezes when attempting to open a file

[MMK21Hub]

When clicking the Open File icon in the toolbar, the web page stops entirely responding.

Steps to reproduce

1. Visit https://rttv.ca/main
2. Click the Open File icon in the toolbar

Additional information

The following error is logged to the console:

Uncaught ReferenceError: shouldOpenDialog is not defined
    at tryOpenDialog (script.js:2:22)
    at nbtworkbench_bg.wasm:0x5c900
    at nbtworkbench_bg.wasm:0xeb7d7
    at nbtworkbench_bg.wasm:0x13b6b3
    at nbtworkbench_bg.wasm:0x12c0c4
    at nbtworkbench_bg.wasm:0x6afaf
    at nbtworkbench_bg.wasm:0x2ee4eb
    at __wbg_adapter_32 (nbtworkbench.js?version=2:227:10)
    at HTMLCanvasElement.real (nbtworkbench.js?version=2:212:20)