This study actually follows that chain:
https://www.nber.org/202603/digest/pass-through-tariffs-evid...
In this case the importer was losing money post tariff so was the exporter. the consumer was actually paying more than the tariff (due to margin).
making each actor "whole" in even this short, cut-and-dry chain would be extremely difficult not even counting the overhead of each entity issuing refunds. A product with multiple importer inputs and more hands in the pot would be nearly impossible to even trace and you'd have to be able to definitively construe that each change in price at each step was directly related to tariffs, maybe someone in the chain was already going to raise prices some and then didn't raise any more on top of the tariff thus the tariff increase was absorbed by a pre-planned price hike.
Did people get charged more? yes. Are you getting your money back, no. does it suck? yes. Is it some conspiracy to make importers more wealthy? no. Were more than just end consumers harmed? yes! Is this fair? fuck no, but truly fair is impossible so might as well do something rather than let the corrupt government keep their ill gotten gains.