To reproduce:
set protocols isis interface eth1 set protocols isis net '49.0001.1921.6800.1002.00'
now enable SPF
set protocols isis spf-delay-ietf holddown '20' set protocols isis spf-delay-ietf init-delay '31' set protocols isis spf-delay-ietf long-delay '30' set protocols isis spf-delay-ietf short-delay '32' set protocols isis spf-delay-ietf time-to-learn '44'
This will only render the FRR config line: spf-delay-ietf init-delay 31 which is incomplete:
frr-reload output: 2 2022-04-03 12:35:24,764 ERROR: vtysh failed to process new configuration: vtysh (mark file) exited with status 4: frr-reload output: 3 b'line 15: % Command incomplete: spf-delay-ietf init-delay 31\n\n'