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Just playing around a little... it's not perfect but whatever, don't feel like rerendering this at all 😛 Hint: It loops! Mindfuckery_FINAL.mp4

My assumption is, you may have confused the correct "Object" input port of the cloner in the past (kudos to MAXON for naming the parameter identical to an Object nodes object port), which may have corrupted something. Because whatever you put into the Stream_Spline parameter, it does not appear in the cloner's Object parameter (despite the parameter being shown as driven). Another indicator is second Cloner_Length node with those undefined ports, probably indicating the node no longer refers to the object it was intended for. I removed both Cloner_Length nodes and then re-added one, exposed the _correct_ Object input port and connected it to the Stream_Spline parameter output. Now, the object set in User Data is also correctly reflected in the cloner's Object parameter in Attribute Manager. But I wasn't able to test any further, as I have no idea, nor motivation to think about it, to which parameters of the cloner the other two parameters were connected to (those undefined ports). But I'd say, if you recreate that node as well, it should work as intended again.