When I open an egg the pet model won't spin somtimes

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“When I open an egg, the pet model sometimes won’t spin. I don’t know what causing the issue.”

Video:

Module Script

local runService = game:GetService("RunService")
local tweenService = game:GetService("TweenService")

local Maid = require(script.Maid)
local Module3D = require(script.Module3D)


-->> Private methods

local function convertToModel(obj)
	local model = Instance.new("Model")
	model.Name = obj.Name

	for _, child in ipairs(obj:GetChildren()) do
		child.Parent = model
	end

	model.Parent = obj.Parent
	obj:Destroy()

	return model
end

-->> Class

local Viewport = {}
Viewport.__index = Viewport
Viewport.Types = require(script.Types)


function Viewport.new(viewport, viewportType)
	local self = setmetatable({}, Viewport)

	self._viewport = viewport
	self._model3D = nil
	self._maid = Maid.new()
	self._resettingSpin = false
	self._defaultCf = CFrame.new(0, 0, 0)
	self._viewportType = viewportType or Viewport.Types.Default
	self._depthMultiplier = self._viewportType.DepthMultiplier or 1
	self._angle = 0

	return self
end


function Viewport:Display(obj, frame)
	local model = obj:IsA("Model") and obj or convertToModel(obj)

	if self._model3D then
		self._model3D:Destroy()
	end

	local model3D = Module3D:Attach3D(self._viewport, model)
	model3D:SetCFrame(self._viewportType.Angle)
	model3D:SetDepthMultiplier(self._depthMultiplier)
	model3D.Visible = true

	self._maid:GiveTask(model3D)
	self._model3D = model3D
	self._defaultCf = model3D:GetCFrame()

	return self
end


function Viewport:SetDepthMultiplier(depthMultiplier)
	self._depthMultiplier = depthMultiplier
	return self
end


function Viewport:Spin(speed)
	speed = speed or self._viewportType.Speed or 1

	self._spin = self._maid:GiveTask(runService.RenderStepped:Connect(function(dt)
		self._angle += dt*speed
		self._angle %= (math.pi*2)
		self._model3D:SetCFrame(self._defaultCf * CFrame.Angles(0, self._angle, 0))
	end))

	return self
end


function Viewport:StopSpin()
	if self._resettingSpin and self._spin then
		self._resettingSpin = false
	elseif self._spin then
		self._maid[self._spin] = nil
	end
	return self
end


function Viewport:ResetSpin(animDur, dynamicSpeed)
	animDur = animDur or 0
	self:StopSpin()

	local alpha = 1
	local startAngle = self._angle
	local cf = self._model3D:GetCFrame()

	if animDur > 0 then
		local start = os.clock()
		local easingStyle = Enum.EasingStyle.Quad
		local easingDir = Enum.EasingDirection.Out

		-->> Whether or not to change speed according to the distance
		if dynamicSpeed then
			local angle = 360 % math.deg(self._angle)
			local speed = angle >= 180 and ((angle/2) / 180) or (angle / 180)
			animDur *= speed
		end

		self._resettingSpin = true

		-->> Lerp it back to its fully reset cframe
		while os.clock() - start <= animDur and self._resettingSpin do
			local dur = os.clock() - start
			alpha = tweenService:GetValue(dur / animDur, easingStyle, easingDir)

			self._model3D:SetCFrame(cf:Lerp(self._defaultCf, alpha))
			self._angle = startAngle + (alpha * (self._defaultCf - startAngle))
			runService.RenderStepped:Wait()
		end
	else
		self._model3D:SetCFrame(self._defaultCf)
		self._angle = 0
	end
	self._resettingSpin = false

	return self
end


function Viewport:Destroy()
	self._maid:DoCleaning()
	self._maid = nil
	self._model3D = nil
	self._viewport = nil
end


return Viewport