TypeError on customising PayPal Checkout Button with style = { fundingicons: 'true' }

[hannahbennett27]

Adding the following style attribute results in the console logging a TypeError:
style = {  ... , fundingicons: 'true'  }

Console error message:
TypeError: window.paypal.Checkout.renderTo(...) is undefined

renderCheckout      checkout.js:254

Error message present on app in development and on PayPal's 'interactive code demo'. 

Please advise if this is a PayPal bug to be remedied? OR if there are code amendments that will rectify?

Thank you!