We are trialing a fix for the inventory crash bug on our SkyWars gametype (all variants, all regions). If this trial proves successful, we will have this fix deployed to all of our games today.

We are aware that inventory opening is delayed in 1.16: this is due to Minecraft 1.16 making inventory opening server-sided, which incurs a delay based on your latency (ping) to the server. We have submitted a request for this to be reverted in a future Minecraft update.