jigsaw-fit
warning by default
An internal jigsaw block (the block in front of it is inside its own piece, such as an arch mount on a road, or a jigsaw inset by a block by mistake) whose pool has pieces that stick out of the piece however they are turned. The game only places a piece joined at an internal jigsaw wholly inside its parent, so those pieces are never placed there. Height is not checked for terrain_matching pieces.
Changing it
Set the rule's severity in mms.json, to error, warning, info, hint or off:
{
"lint": { "jigsaw-fit": "off" }
} To silence it on one line, write // mms-ignore jigsaw-fit on the line or the line above. See Lint rules in the guides for more.