The xTool D1 pro is not running GRBL, but a compatibility layer over their proprietary firmware.
@Kuth We made this special “xTool” device type, which bypasses this compatibility layer.
It is recommended to use this for the D1, D1 Pro and S1.
For reference: Setting up xTool S1 with new xTool device type in LB 1.7 and Beyond
I can confirm, that Continous Framing for the xTool device type is also missing on older versions, and I’m sure there’s a good reason for it.
xTool has some “undocumented features”, for example: Their firmware seems to have different acceleration speeds for engraving and marking/cutting, and they use some “magic heuristic” to decide which one to use.