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Issue description:

When using the command "/mek radiation heal" the following target does not effect non player entities, i questioned the contributors and collaborators on the discord, (as no devs were active at the time) and they said to make an issue report here. The Prompt returned when executing the command on a specific uuid of a mob, States that the heal command does not work for non player entities so i feel like this isn't a new topic but one that i think should be resolved/relooked at.

Steps to reproduce:

1. irradiate an area containing a mob
2. attempt to execute the command "/mek radiation heal (either @e or a specific entity UUID)"
3. mob is not healed and a return of " Only players may be affected by this command, but the provided selector includes entities /mek radiation heal @e<--[HERE] "

Version (make sure you are on the latest version before reporting):

Forge: 1.16.5-forge-36.1.16
Mekanism: Mekanism-1.16.5-10.0.21.448.jar
Other relevant version:

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