Spine Skeleton rendering full opacity under parent with 0 opacity

Cocos Creator version

3.8.6

System information

Windows 11, Cocos Creator, any rendering

Issue description

editor version: 3.8.6 but probably also on older ones.

spine versions: 3.8, 4.2

Intent: Activate a node with a spine skeleton animation under a parent node with UIOpacity component set to 50 and play an animation. The spine should start displaying the animation already with correct opacity taken from hierarchy.

Instead you will see: Spine animation activating with full opacity (255) for the first frame, and from the second one correctly retrieves the uiopacity from hierarchy parent.

Additional notes:

• It happends generally only the FIRST time that the spine is enabled in the scene. if you would deactivate the node and re-activate it doing the process again it won't happend.

• if the UIOpacity component is placed on the same node of the skeleton instead, the bug doesn't happen

Relevant error log output

No response

Steps to reproduce

the structure of the scene should be something like this:

canvas --node <- add UIOpacity component with opacity 50 as test ----skeleton <- add sp.Skeleton

node needs to be NOT ACTIVE skeleton child of node

Execute via script:

node.active = true
let skeleton = node.getComponentInChildren(sp.Skeleton)
skeleton.setAnimation(0, 'animationname')

Minimal reproduction project

follow steps