This change automatically strips out <style> tags and custom HTML attributes that are added in the custom HTML view every time you edit and save a Quote/Invoice template. As a result, you have broken quotes and invoices for numerous customers that have relied on this functionality for years.

Please see this thread for further information:

This needs to be addressed as you cannot expect your customers to fix Quote and Invoice templates that have worked for years. (especially with no advance notice; this change was unannounced and only discovered by chance when attempting to create new quotes and invoices for our customers)

Thank you.