Recently I ran into an easyplacemode problem. I calmly put the blocks with the right mouse button, but at one point I started getting an error (in the screenshot), the error was earlier and was corrected only by switching to an older version of litematice, but now it doesn't work either

If you read the warning message, it says to check the pickBlockableSlots config.

Now granted maybe the warning message wasn't the clearest when it just says "no suitable slots found", but in this case it means that you have tools in all of the first five hotbar slots, and only the first five slots are by default allowed for the pick block function, set by the above mentioned config option. And the newer mod default behavior doesn't replace tools in the hotbar anymore, unless you go and flip the other mentioned configs to allow it.

But basically most likely you just want to edit the pickBlockableSlots config to allow all hotbar slots => 1,2,3,4,5,6,7,8,9.