Import of backup folder does not work reliably

This issue serves to gather raised issues when using the Specter backup (zipped folder) to import wallets. Most reports are mentioning that no transactions were found when importing wallets like this whereas it works when importing the individual `wallet.json` files via the wallet settings. No issues regarding the devices import known.

Could very well be due to specific node implementations of Specter:
- In the case of myNode it seems to be only happening for Specter running on **myNode**
- Similar for embassy https://github.com/Start9Labs/specter-wrapper/issues/41

Start by reproducing imports from a Specter backup zipped folder and compare them with importing individual wallet.json files through wallet settings. Check whether transaction discovery differs on myNode and embassy deployments, using the linked embassy report as context. Done means wallet imports consistently include transactions while device imports remain unaffected.

Written by the indexing model from the issue text.