Not working in Magento 2.3.4

[ludo-mon-key]

I'm getting a console error when try to select "cash on delivery" on checkout::
/rest/it/V1/carts/mine/selected-payment-method 500 (Internal Server Error).
The error:
Property "DisableTmpl" does not have accessor method "getDisableTmpl" in class "Magento\Quote\Api\Data\PaymentInterface".

I tried the suggested solution here:
https://magento.stackexchange.com/questions/292776/magento-2-3-3-paypal-problem-while-checkout
but it does not work

Any help appreciated, thanks!