There appears to be a bug with the Proteus respawn window being 30 minutes long as opposed to the stated 15 minutes on the announcement. The announcement was incorrect in stating no change with a 15 minute window since the previous respawn window was supposed to be 10 minutes, and then also incorrect in not actually applying neither 15 minutes nor 10 minute respawn windows.
Here are the links to the said posts:
10 minute respawn windows: #game-announcements message
"No Change" respawn time: #game-announcements message