After a long long long work I'm happy to present you the first beta version of PosePlugin 4.0!
It has a lot of changes, be sure to check them out:

• Plugin has been updated to 1.17
• The resource pack has been updated, be sure to update it.
• Point pose has been renamed to Clapping
• Added 2 new poses. Spinjitsu and Pointing
• Added new Deep-Dive mode to Experimental poses.
• Added new package finding system, so you can see during the startup some classes loading
• Updated to Java 16. This version cannot be loaded on older versions
• Plugin now uses Mojang Mappings
• Equipment synchronization for lying NPC is working on NPCInventory
• Changed config.yml and language file. Be sure to update it
• Added automatic command generator
• Fixed some bugs

Since it's an beta version, some bugs can occur, so be sure to report all the bugs you'll find during the test.
If you have an error in the console, upload full log from the console.
Also i'd be REALLY thankful if you support my work by donation
Edit: currently 1.16 is now working correctly, i'm fixing it after some time.