May related to T925 ; with some blocks the yellowish overlay cause some transparency issue in build mode with the remove mode cursor. We can see background like if there were a hole in the structure (i.e. black hull block).
Here a gif :
{F6223}
And fews pictures :
{F6217}
{F6221}
But it don't seems affect all blocks (i.e. the white hull block).
{F6219}
I didn't took screen but blocks like small cactus render like disappear when overlay by the remove cursor (we don't see the object inside the cube).