Magento 2.4.2 Email and Customer Account Name Prefix Problem

Hello.

After upgrading our store from 2.4.1 to 2.4.2, I have noticed that customer names are not coming through with name prefixes, but rather numbers? These numbers are appearing on customer orders and in the transactional emails, example 0 Joe Bloggs and 2 Sandra Jeffries?

 

Anyone else getting this with Magento 2.4.2? This wasn't happening in 2.4.1, nor have customer settings or email templates been changed.

 

Any help resolving this greatly appreciated!