it appears also the API returns empty response when deleting a label from an issue.
https://github.com/badhezi/gitea/blob/main/routers/api/v1/repo/issue_label.go#L196

	if err := issue_service.RemoveLabel(ctx, issue, ctx.Doer, label); err != nil {
		ctx.APIErrorInternal(err)
		return
	}

	ctx.Status(http.StatusNoContent)

can you show an example where DELETE /repos/{owner}/{repo}/issues/{index}/labels/{id} returns a list of current labels after the deletion?
anyhow it's seems like this is not implemented, AFAIK.
I can implement that if needed, github's API does that.

edit: I see what you mean, when triggering a delete from API the webhook payload does include the labels. looking into that

Found the issue
when removing an issue label from web, this function is first being called

this prevents this function

this flow is not triggered with calling from API as there is no need to render the issue labels for the user prior to the request.

Sorry, was on vacation. Glad to see you've found something :)