ZAFClient doesn't update the UI

We have a custom app that suddenly stopped working with no changes in our end. The app is updating the tags on the ticket by doing:

const client = ZAFClient.init()
client.invoke("ticket.tags.add", “newTag”)

the code runs fine and returns no error:

{
	errors: {}
	ticket.tags.add: ['newTag']
}

but the UI is not updated anymore, which leads to the ticket having no tag when submitted.

We tried using .set() instead of invoke but the same thing happens. Same thing if we try with remove instead of add, no error, but no impact on the UI

Running client.get("ticket.tags") returns the added tag even tho the UI doesn't show it.

In contrast, running client.invoke("ticket.comment.appendHtml", “html”) works as intended

Did something change? is this a possible configuration issue?

Thanks