Construction units on patrol fail to move to repair a nearby unit that's just outside their build radius

happens on any recent builds, 2438 to 2583
MF v2.41c (or any version)
Any map

- happens when damaged unit is moving outside the builders build radius
- happens despite disabling luaui and luarules
- sometimes when the damaged unit stops the builders move to repair it properly
- holding shift while the builders are selected shows them repeatedly issuing the repair orders over the patrol but cancelling them immediately after
- maneuver or roam move state doesn't seem to affect it

Reproduce the patrol scenario on a recent build, including a damaged unit moving just outside the builder's build radius, with Lua UI and rules disabled. Trace the patrol repair-order behavior and verify that builders no longer repeatedly issue and immediately cancel repair orders while the damaged unit is moving; confirm the behavior across relevant move states.

Written by the indexing model from the issue text.