kfst broken on omorfi.generate.hfst

[thfrkielikone]

kfst fails to produce results where hfst does

Version of kfst tested: 3.0.1 (works with 2.0.0)

Steps to reproduce:

Download omorfi tranducers from https://github.com/flammie/omorfi/releases/tag/v0.9.9 (file omorfi-hfst-models-0.9.9.tar.xz). Test omorfi.generate.hfst first with hfst-lookup with the following string

[WORD_ID=juosta][UPOS=VERB][VOICE=ACT][MOOD=INDV][TENSE=PRESENT][PERS=SG1]

Produces result juoksen with weight 0,000000.

Convert transducer with hfst-fst2txt -f att. Load transducer with kfst, the same string yields results []:

Python 3.11.5 (main, Aug 24 2023, 15:23:30) [Clang 14.0.0 (clang-1400.0.29.202)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from kfst import FST
>>> fst = FST.from_att_file("omorfi.generate.att")
>>> 
>>> fst.lookup("[WORD_ID=juosta][UPOS=VERB][VOICE=ACT][MOOD=INDV][TENSE=PRESENT][PERS=SG1]")
<generator object FST.lookup at 0x108a55800>
>>> list(_)
[]

This affects pyomorfi too in that pyomorfi.generate returns an empty list for the same string.