Type 1 fonts open with smooth nodes as corners

It appears that all Type 1 fonts I open in Glyphs (2.3) show up with corner nodes in place of smooth. This does not apply to TTF or OTF’s opened in Glyphs, or T1 opened in e.g. FontLab. It is easy enough to correct (with Tidy up Paths or bulk conversion of nodes), but I cannot understand why, if this behaviour is common, I can find no reference to it. What am I missing?

In all font formats, there is no information about ‘smoothness’ of nodes. In all cases that is calculated on import and it seems that it is not working for Type1 fonts. I’ll have a look.

You simply need to run “Tidy Up Paths” on all glyphs.