Doesn’t generate glyphs when unicode value is missing

[LaPolice]

RoboFont 4.5 (build 2410282152)
Python 3.12.1
MacOS 12.7.6 (Darwin 21.6.0)
Processor i386 (x86_64)

Using Scale Fast 1.1, some of my glyphs weren't being interpolated – a font file is generated, though – whereas validated by Prepolator and showing up using Designspace. It appears that they were missing a unicode value. I've checked Scale Fast's documentation, which doesn't mention this value as crucial.