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Had this with the lowest tier dt Swiss rims (£40/45 price point), put a 650b 2.5" ish tyre to 50 psi and the rim erd shrinks so much that it becomes like a wet noodle. Also had it with one of their Gravel rims (again the lowest tier). Don't Reccomend the lowest ones anymore. Tension dropped from 55 wot nots down to around 35. Whereas a mavic rim of same price was only dropping to 50 at the same pressure (same hub/spoke/nipple combo)
BrickMan
MCamb
I’ve heard of a few similar issues where a modern, wide, lightweight tubeless rim has been used with a tyre at really high pressures, which effectively reduced the overall ERD of the rim and decreases spoke tension markedly. This could then lead to spokes slackening off further (as undertensioned nipples tend to do), and the above issue.
Might not necessarily be the case here, but definetly worth bearing in mind with other cargo wheel builds, that tend to use wide rims and see higher pressures than these rims are designed for.