On 1.12.2 structure blocks used to show their mode of operation (data, load or save) as well as the name of the configured structure in a 'hologram' style fashion (the name was displayed above the block).

On 1.13 this is no longer the case. I checked several release notes but couldn't find this change mentioned so I suspect a possible bug.

The reason for reporting is that it is a lot easier to be able and read the name (and operation) without having to open the structure block interface.