I have just posted version 1.0.4 of Blockchain Tools, which fixes parsing of Bitcoin addresses from transactions posted on the blockchain and retrieved with the Bitcoin Core API version 22.0. Earlier versions of the API returned an array of addresses, while in 22.0 this was changed to a single address item. The code is structured so that it handles either form of specification, preserving compatibility with earlier releases of Bitcoin Core.
If you’re running a pre-22.0 version of Bitcoin Core, you can update to 1.0.4 and everything will work both with your current installation and after you update to 22.0 or later.
This fix applies only to the Bitcoin node Address Watch and Confirmation Watch utilities. If you do not use these components, there is no need to install this update.