Calculate_taxes_and_totals override not working in background jobs on Frappe Cloud

ERPNext Customize ERPNext
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Hi ,

I’m using ERPNext / Frappe v15 and have overridden
erpnext.controllers.taxes_and_totals.calculate_taxes_and_totals using a monkey patch in hooks.py.

I’m overriding it like this:

def override_calculate_taxes_and_totals():
    import erpnext.controllers.taxes_and_totals as taxes_and_totals
    from custom_app.taxes_and_totals import CustomTaxesAndTotals

    taxes_and_totals.OriginalCalculateTaxesAndTotals = taxes_and_totals.calculate_taxes_and_totals
    taxes_and_totals.calculate_taxes_and_totals = CustomTaxesAndTotals

override_calculate_taxes_and_totals()

This works correctly when:

Creating or updating documents from the UI

But it does not work when updating multiple documents via bulk update / background workers.

This is Works fine on a self-hosted Ubuntu server but Issue happens only on Frappe Cloud

Is there any limitation or recommended way on Frappe Cloud to ensure monkey-patched overrides like calculate_taxes_and_totals work reliably in background jobs / bulk updates?

Thanks!