This version is an update to minecraft versions 1.20.5/1.20.6 !
This is only a BETA-release !
Since some dependencies (ProtocolLib) still didn't get any updates, this DSL-update may still have issues...
But I'm done with waiting, even though I don't know if it's working when ProtocolLib update comes out 
DragonSlayer may need another update then!
Protocollib has updated and seems to work again without me having to change anything
So, if you use the 'NPC' on an 1.20.6 server for the slayer statue, please set 'statue_version' value to 1 for now. You have to use the armorstand statue until ProtocolLib gets an update...
NPC can be used with latest dev build of ProtocolLib, now!
The rest should be ok!
If not -> please let me know! (use the discussion or DM me!)