In the plugin version 4.0.0 the armor is not synced if a player takes armor and puts it on and then goes offline and you then look at the armor with /mpdb armor and the player then comes online, he still has it Armor, and yes I know I'm using an outdated version that's because the latest one isn't compatible with 1.17.1, by the way I've already written an article about this (https://github.com/brunyman/MPDB/issues/74 )
In the plugin version 4.0.0 the armor is not synced if a player takes armor and puts it on and then goes offline and you then look at the armor with /mpdb armor and the player then comes online, he still has it Armor, and yes I know I'm using an outdated version that's because the latest one isn't compatible with 1.17.1, by the way I've already written an article about this (https://github.com/brunyman/MPDB/issues/74 )