While adding the any vehicle type signals the naming schema for the auto generated position signals annoyed me, it used to be "LTN-<vehicle_name>" while all other signals are "ltn-<descriptive_name>".
So with 1.10.13 that naming schema was changed to "ltn-position-<vehicle_name>".
Sadly migration scripts don't support regex for migrating auto generated signals.
The only signals still working after upgrading to 1.10.13 are for base vehicles where I knew the exact names and could write a migration script.
All position signals for modded rolling stock vanish and have to be set again, including in blueprints.