You still did not find solution ?
If so i would suggest to try completely without usage of DATASET, going just the wix-data-query-way.
Why using wix-data is the better option ?
- DATASETs are binded to just one DATABASE (coded version can be binded to any)
- Trying to help regarding a usage of a DATASETs in most cases are more complicated, because the helper do not see how is exactly the setup of the requester (including dataset-settings and connections).
These are just a few reasons why going the more coding way.
Of course DATASETS are not bad, but if you can not handle them, better you do not touch them. GO THE CODING-WAY.
By the way → The coding way is more FLEXIBLE one.