Some overlays (antimagic, radioactive mutation) never disappear

[MonkestationIssueBot]

Reporting client info: Client Information:
BYOND:515.1647
Key:absolucy

Round ID:

8881

Testmerges:

• What makes me a good demoman?
• [DNM] Aneri except I redid the branch again
• Heliostation from fulp
• Port various UX improvements from tg
• Its cogging time(again)
• 3D printed guns.
• Adds a second bartender slot
• [BOUNTY] Port Skyrat's feature to be able to play the character we want in a ghost role (using character loadouts
• Some minor bloodsucker fixes
• Update tramstation robotics
• Revert "Fixes and balances some problems with satyrs (#4712)"
• [PORT] ports tg's void heretic rework
• More Various fixes
• [DNM] Icon and filter optimization stuff
• Fix Gary being able to steal items from borgs and such
• The shot gun
• [PORT] Ports the port of traitor backstories from yogstation from beestation
• Allow pAIs to withdraw their candidacy
• [DNM, NEED TO TEST] Potential fix for give alert getting stuck, maybe?

Reproduction:

Some overlays, such as from the radioactive mutation, or antimagic activating, never seem to go away

[Absolucy]

antimagic not disappearing is caused by #4140

[wraith-54321]

Added a PR fixing the antimagic issue