MassiveCraft will be implementing an inventory split across game modes to improve fairness, balance, and player experience. Each game mode (Roleplay and Survival) will have its own dedicated inventory going forward. To help players prepare, we’ve opened a special storage system to safeguard important items during the transition. For full details, read the announcement here: Game Mode Inventory Split blog post.
Your current inventories, backpacks, and ender chest are in the shared Medieval inventory. When the new Roleplay inventory is created and assigned to the roleplay world(s) you will lose access to your currently stored items.
Please make sure to submit any items you wish to preserve in the trunk storage or one of the roleplay worlds before the deadline. After the split, inventories will no longer carry over between game modes.
Here is the one I have been looking at but it is out of date I think so maybe one similar.
