Modpack version
0.4.8 via CurseForge/Overwolf

Describe the bug
Some of the Ars Nouveau spells can still take effect inside another player's protected chunks. Ones I've identified so far:

• Ignite - creates flames
• Intangible - makes blocks temporarily non-solid. Can break doors, mess up other connected blocks, and allow access to closed areas.
• Conjure Water - 'nuf said
• Phantom - creates temporary phantom blocks
• Light - creates floating lights
• Smelt - can smelt protected logs for infinite charcoal, ores for infinite ingots, and can transform stuff like sand into glass.
• Gravity - causes blocks to be affected by gravity like sand. Can be combined with Light to steal blocks.
• Interact - bypasses interaction protection, allowing full access to containers, machines, etc

Logs
n/a

Screenshots
If applicable, add screenshots to help explain your problem.

Thank you for the report, I will investigate the issue.

Can they be cast inside the protected chunks, or does it only work when casting a projectile in?

You can cast the spells outside the protected area to a protected area, using projectiles.

As of 0.4.8 you can cast while inside a protected area, as well as into it from outside.