Mine is also 23.12.2.Out of curiosity, what is people's Tesla Powerwall 2 firmware's at? I'm still on 23.12.2 (which came out last year)
Numbering convention is similar to the car firmware, ie YY.WW.nnn so that firmware is from a branch started in week 12 of 2023.
See Software Updates | Tesla Support Australia - and note that 23.12.* is still too new (sigh) for that version to even be listed on that page; it often lags the actual releases by a month or two.
To get the smart solar-tracking car charging - ie “Drive on Sunshine” - feature it needs to be 23.12.10 (and the car on 2026.26.* or later). Hopefully not too far away in either case.