As the title says, the game produces an error trying to place a blueprint of landfill. It has definitely worked in 0.16 with your fix in a SeaBlock game I started a while ago. The error, posted below, is a quick new game running Creative Mode and Landfill Painting. Using Bot Landfill instead produces the same error.

Error while running event creative-mode-fix::on_tick (ID 0)
Error while running event LandfillPainting::on_robot_built_tile (ID 47)
LandfillPainting/control.lua:20: attempt to index field 'item' (a nil value)
stack traceback:
creative-mode-fix/scripts/util.lua:159: in function 'raise_event'
creative-mode-fix/scripts/util.lua:251: in function 'raise_event_for_revived_tile_ghosts'
creative-mode-fix/scripts/util.lua:274: in function 'revive_tile_ghost_and_raise_event'
creative-mode-fix/scripts/cheats.lua:2800: in function 'tick'
creative-mode-fix/scripts/events.lua:177: in function <creative-mode-fix/scripts/events.lua:146>

Update: I found a post on r/factorio about this error starting in 0.16.18 with mods (Bot Landfill per the post) using the on_robot_built_tile event.

I may have fixed this; let me know if it keeps crashing and where, as there were a few spots that needed changing, and some of those spots had a large amount of abstraction so I may have made errors with the fix. The implemented fix is only a partial fix so far.

It works perfectly.Thanks.