While the same ticket shows correct rendered html in HelpDesk module page, in the Ticket module page the description is rendered as normal text.
it’s not related to api directly more a bug on the whole system.
Hey team 
I recommend opening a support ticket for this issue and let them know this is a product-related issue and not about getting help with custom code.
Best,
Jaycee
no it’s ok, I just leave the notice here, if the devs want they could open themeselves a ticket in their support tool…
in the age of AI I would imagine that an AI agent could automatically do that for them with ease 
… asking customers to do it ? …uhmmm… maybe not the right path here… anyway this bug is quite basic no need of further info… just render description of a ticket as it is rendered in HelpDesk module…and done easy!
cheers!