Player Collider not being detected by area signal while being detected otherwise.

[proud marsh]

There is a small but important difference:
First you're checking for a body, then you are checking for an area

If the player is a solid physics object, like a Characterbody or Rigidbody, it will only trigger the body_entered signal or be recognized by get_overlapping_bodies()

The other signal area_entered checks if another area node entered this area

[proud marsh]

You can add
class_name Player
To the top of your player script and use
if area is Player
To detect if the incoming object is of that script type

Also I'm assuming you connected the body_entered signal to this function now, which is a bit confusing because its name and parameter variable area indicate to the reader you're checking for areas still 😉

But the player is a Characterbody obviously and if you used the auto-generated function that gets created when you connect the body_entered signal to the script via the editor the naming will better reflect what's going on internally