"Null" "unverified" asset is shown when making a Rootstock RBTC transaction

[john-light]

When the user makes a transaction using RBTC on the Rootstock network, RBTC is shown as "null" and "unverified". Here is an example, attempting a swap of RBTC to XUSD using Sovryn:

To contrast, here it what Liquality shows for an XUSD to RBTC swap. Liquality shows the asset name XUSD (not "null") -- although it is still labeled "unverified" which sounds kind of scary and it is not really clear what this means (verified by who? what is the implication of an asset being "unverified"?)