MQTT byte handling changes between R2024B and R2025A

There appears to be a very major functional change between R2024B simulink Raspberry Pi Target and R2025A simulink Raspberry Pi Target for MQTT publish block,

where in the previous release, on publishing a vector, one would get a string with bytes encoded as a variable length ascii string with a numbers ("0" to "255" and a space " " as a separator)

and in the new release, one gets straight binary bytes,

And yet there is not a yota of documentation about this,

Come on Mathworks, aren't you supposed to be professional about such things?