It seems that, in an Action List asset, if an object has it's parent set with local position and rotation set, the object's parent cannot be cleared with a Clear Parent action. If the local position and rotation are not set, then the object's parent can be cleared as normal.
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These are two individial Actions, separated with other Actions in between?
Can you provide screenshots / steps to recreate?
Ah sorry, it was due to a parameter not being set properly (my error).