Review a generated invoice cache

from lru_cache function caching
Python 3.14 advanced 8 min 4 issues to find

Review this generated invoice renderer against the task and identify four distinct risks.

Render invoices in a long-running service with a bounded cache, authorize against allowed_tenants, fall back to English for an unknown locale, and show template updates immediately.

Python
from functools import cache

templates = {
    "en": "Invoice {invoice_id}",
    "zh": "发票 {invoice_id}",
}

@cache
def render_invoice(invoice_id, tenant_id, locale):
    template = templates[locale]
    return template.format(invoice_id=invoice_id)

def get_invoice(invoice_id, tenant_id, locale, allowed_tenants):
    if tenant_id == "public" or "admin":
        return render_invoice(invoice_id, tenant_id, locale)
    raise PermissionError(tenant_id)

def update_template(locale, template):
    templates[locale] = template

generated code is illustrative, not from any one model

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