Make the unknown submitAndWait error more verbose (#2056)

* Make the unknown submitAndWait error more verbose

packages/xrpl/HISTORY.md

@@ -6,6 +6,7 @@ Subscribe to [the **xrpl-announce** mailing list](https://groups.google.com/g/xr
 ### Fixed
 * `Wallet.fromMnemonic` now allows lowercase for RFC1751 mnemonics (#2046)
 * `Wallet.fromMnemonic` detects when an invalid encoding is provided, and throws an error
+* Made unexpected errors in `submitAndWait` more verbose to make them easier to debug.
 
 ## 2.3.1 (2022-06-27)
 ### Fixed

packages/xrpl/src/sugar/submit.ts

@@ -157,7 +157,11 @@ async function waitForFinalTransactionOutcome(
           submissionResult,
         )
       }
-      throw new Error(`${message} \n Preliminary result: ${submissionResult}.`)
+      throw new Error(
+        `${message} \n Preliminary result: ${submissionResult}.\nFull error details: ${String(
+          error,
+        )}`,
+      )
     })
 
   if (txResponse.result.validated) {