Last Monster Won't Die on Blighted Map

On a T15 Blighted Arsenal map (anointed with 3 amber oils) the last monster won't die. One monster with a sliver of health remains alive and stationary despite all attempts to kill it. Towers used were Scout and Meteor Towers and the primary skill used was Explosive Arrow via totem. Map mods are below in the event that is helpful. This happened yesterday as well on one map, but I can't remember the circumstances.
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Arsenal
Monster Level: 82
Short Allocation
Washington, DC (US) Realm

Area is inhabited by Skeletons
Players cannot inflict exposure
Players are cursed with temporal chains
Monsters fire 2 additional projectiles
Monsters deal 110% extra physical damage as cold
Map's Item Quantity modifiers also affect Blight Chest count at 20% value
Can be anointed up to 3 times
60% reduced cost of building and upgrading towers
natural inhabitants of this area have been removed
99% increased quantity of items found in this area
42% increased rarity of items found in this area
42% increased pack size
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Last bumped on Mar 16, 2022, 3:25:46 PM
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sometimes this happens to me with metamorph, leaving and rejoining the instance usually fixes it for my metamorph bosses being unkillable. its a rare issue at least

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