Tom Bombadil does not trigger when the last chapter of a saga is triggered and doesn't have valid targets
Tom Bombadil was on the battlefield, the final lore counter was placed on The Eldest Reborn, the ability went on the stack and fizzled due to no legal targets, but Tom Bombadil failed to trigger his cascade ability. it also happened with Elspeth Conquers Death
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Rezzahan#77802
commented
Tom Bombadil only triggers, if the final chapter of a Saga resolves. But in both your cases, the final chapter ability couldn't even be placed on the stack due to lack of legal targets, so it could not resolve. Hence, Tom Bombadil did not trigger.