I have done some test on LGT8F328P-SSOP20 years ago. It may drop down to ~50uA under sleep mode. You may found the lgt8f branch in https://github.com/arcayi/mysensors/tree/lgt8f, which unfortunately was not accepted by master.
Posts made by arcayi
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RE: head's up: LGT8F328P is allegedly a chinese clone of the atmega328pposted in Hardware