The BT850, BT851 and BT860 are listed as Bluetooth 5 modules. What Bluetooth 5 features do they support?

The BT850, BT851 and BT860 are Bluetooth 5 qualified modules. However, these modules do not support any Bluetooth 5 features.
Per the Bluetooth SIG FAQ, "there are no mandatory features that must be claimed to use the Bluetooth 5.0 specification. However, manufacturers are required to implement all interoperability improvements and errata applied to Bluetooth 5 in order to comply with the specification".