Issue with using character's Y orientation

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#1 
local function snapRotation(target, snappedZRad)
	
	if target and target.Name ~= "ATTACHMENT" then return end
	if not target then return end
	
	local primaryPart = target.Parent.PrimaryPart
	if not primaryPart then return end

	local cframe = primaryPart.CFrame
	
	local rY = math.rad(char.Head.Orientation.Y)

	target.Parent:SetPrimaryPartCFrame(CFrame.new(cframe.Position) * CFrame.Angles(0, rY -math.rad(90), snappedZRad))
	
end

so, the issue is rY is behaving odd once the player turns to a certain angle, for example; if the player is within that certain angle and stops holding the item they are carrying, and picks it up again the item will be in a new orientation.

my goal was to have the item match the character’s rotation but it’s obviously not working and i’m stuck on how to fix this.

#2

Orientation is weird and doesn’t always work as expected, whenever I try to get the rotation of something I do this which seems to work

local _, radiansY = Part.CFrame:ToEulerAnglesXYZ()
local degreesY = math.deg(radiansY)
#3

your example made it behave even worse, where now it doesn’t follow the characters orientation at a certain angle and instead spins on its axis

edit: i literally have no clue what is causing this

#4

well from my experimentation, the X and Z values of the cframe:ToEulerAnglesXYZ() are somehow tied to the Y value, how can i ignore the Y value?