In the tested workflow, that regexreplace node is inside a subgraph. Unpacking the subgraph causes the exception to then show up referencing another node in another subgraph.

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Validation errors parsing game-XML file: /home/peregrinenelson/triplea/downloadedMaps/2013_conflict/games/2013 Conflict FFA.xml, errors: Wrong number of sea zones for canal (exactly 2 sea zones may ...