Uncaught TypeError: Cannot read property 'default' of undefined

[ubuntutest]

Sometimes, I couldn't figure out why and when it happens, but I get the following error:

Uncaught TypeError: Cannot read property 'default' of undefined

refering to:

const WalletConnectProvider = window.WalletConnectProvider.default;

Even in the following demo it rarely happens: https://codepen.io/polats/pen/dyGXPOz