Currently vanilla gui's do not update to reflect changes in data done through scripts (see https://forums.factorio.com/viewtopic.php?p=585326#p585326). The workaround that is generally used in the modding community is to close the gui, wait a tick, and then reopen it to force a redraw. The issue is ...

Calling set_filter on a LuaEntity does not visually update the filter slots in an already open entity gui. What did you do? Call set_filter(1, "iron-plate") from a Lua Snippet with a filter inserter gui open. What happened? The filter slots on the filter inserter do not visually update to ...

What did you do? Enable blueprint sync on a new steam install of factorio.

What happened? Game crashed with error message.

What did you expect to happen instead? Blueprint sync to be enabled and not crash.

Happens every time when enabling blueprint sync without the blueprint file existing.