Hello, and welcome to the forums.

Since you’re on PC, the first and obvious question it: are you using any mods? Some mods change item IDs in the game, so the Journey system no longer recognizes those building pieces properly.

But even without mods, some journey steps sometimes get a little stuck. I remember having to try the Master Mason one several times with different flavors of building pieces. I think it completed when upgrading a sandstone wall to a stonebrick one, but it has been some time so can’t be sure.