This applies for Xiaomi smart plugs ZNCZ04LM (lumi.plug.mmeu01) and SP-EUC01 (lumi.plug.maeu01). It is mandatory that RaspBee/ConBee I fw 0x26400500 (or higher) or RaspBee/ConBeeII fw 0x266f0700 (or higher) is installed.
Both should look like this from a deCONZ GUI perspective:

If they don't, the following is recommended:



If the devices still do not look like illustrated at the very top after firmware update (or if they already run on the referenced firmware), reset and re-pair it again. This can happen, if the so called node descriptor reponse from the coordinator is not received at all or too late.