[Bug]: autoseparation fails to run with implicit orders

[CactusAcolyte]

Version of OpenTTD

jgrpp 0.63.1, Windows 10 x64 (client), Debian Bookworm (server)

Expected result

Given autoseparation and automation buttons are available with or without implicit orders, it should behave as it does with explicit orders: complete the route, register initial travel times, tweak travel times as needed, and delay as needed to autoseparate

Actual result

(minutes == real time seconds i.e. 27 ticks?)
Schedule completes as normal (running late / early / on time message) and automation tweaks travel times as normal
Autoseparation fails to enable and trains clump up as with no autoseparation

Steps to reproduce

1. Have three stations in a row
2. Schedule vehicles to go-to (no nonstop) the two end stations
3. Automate and autoseparate
4. Watch the timetable, wait a hot minute