Official rule text
22.4 If a component action is canceled, it does not use that player’s dock on a planet they control. Then, that player may place an action. additional PDS on a planet they control. RELATED TOPICS: Abilities, Action Cards, Action Phase,
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 22.4