Documentation of right click function unclear.

[Golutazem]

with Minetest 5.0.1.
Left click has no noticeable effect.
Right click places dirt. It does not replace anything.

[LoneWolfHT]

That's expected behavior. Rightclick places the set node, leftclick sets the pointed node, sneak+leftclick sets the replacer's node to the pointed node, and by default the replacer's node is dirt

[Golutazem]

I misunderstood this to mean that it sets the node type that shall replace other nodes:
"Right-click on a node of that type you want to replace other nodes with. "
As it is written it is unclear or likely to be misunderstood. I can not propose an alternative wording because I do not know what 'right click' does.

[Sokomine]

You need to SNEAK-right-click on a block in order to store it as a new pattern.
Left click replaces the block you clicked on with the stored pattern (if possible).
Right click places the stored pattern (if possible).