Tested using West African CFA franc (CFA) as the default currency, the VFB form (all layouts) cannot proceed when a donation amount has been selected and has a JS console log error currency must be a valid currency.

Current List of currencies causing this:

West African CFA franc (CFA)

Kenyan Shilling

UGX

The workaround to be able to use the currency would be to use a V2 form.