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You can really tell that they wrote parts of the module before publishing the rules…
(ttrpg.network)
For reference: There is a duell in the module where a shaman tries to secretly help one NPC by continously casting Cure Wounds on him while supposedly only helping him "stand up" after he intentionally let‘s himself fall prone. To spot this, a PC has to specifically declare checking for interventions a then suceed a DC 15 perception-check despite being within earshot…
Thanks for pointing this out, that’s better than what I could've said to explain it. The DM can always make changes without adhering to any limitations, but if they are a good DM, they'll at least try to be consistent. And that’s the least I expect from professional writers. (And I similarly expect them to wait for the actual rules of the system to be published before writing an adventure.)