V8.18.0

Features

• #552: Portals can now be placed on the 45° slope of correctly-positioned quartz stairs.
• #551: Portals can now also be placed on Smooth Quartz and Smooth Quartz Stairs.
• #550: Conditional Appearing/Disappearing Blocks made of quartz now work as portal surfaces, and any portal placed on one is removed when the block disappears.
• #550: Conditional Appearing and Disappearing Blocks can now be created from an existing block, copying its exact shape and orientation (stairs, logs, slabs, fences, ...).
• #561: Added the /lasers portal reset <player> command to destroy a player's active portals (does not support @selectors yet).

Fixes

• #546: Fixed the first laser segment being sometimes invisible when entering a puzzle area.