Changing product type reverts back on next scan

Changing product type reverts back on next scan

I am changing the product type for all network printers to their actual model. Product HP-Printer isn't all that helpful if I don't have the model. When I create a custom product-type and save it, it reverts back to HP-Printer on the next network scan. Is there a way to lock it, or even better have the SNMP details filled in better? I could exclude them from scanning, but then I assume the toner levels would not update.
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