Unable to construct due to units stuck in a loop walking in and out of foundation

[Krinkle]

Version: Alpha 24.

Attached: Replay file from a multiplayer match.

At 15:15, the grey player in the west (0xD3C0), tries to build a temple in a cleared woodline using about 40 units, where the foundation is laid but a handful of units on all sides of the foundation are in a loop where they set a few steps toward the middle of foundation and then a few steps back out, and so on.

Capture: ​https://user.fm/files/v2-581ad4e3aa2608e9250d6c3489bee6af/0ad24-20210709.gif (7 MB, 4 seconds)

[Krinkle]

A24-20210708-MP-0xD3C0

[Krinkle]

I recall an issue with this in Alpha 22 and 23, where a unit assigned to collect resources could just stand stuck on a foundation. But that ticket was resolved, and I verified that behaviour during development and later in the released Alpha 24. The units now do try to leave, but there seems to be a case where they can get in a loop explicitly walking back a few steps back onto the foundation and out of it, in a loop.

Older tickets that may be related and are still open:

• (2012) Building foundations should clear actors, #1441.
• (2016) Units walking over foundations block construction, #3625.
• (2021) Units can end up inside the foundation, #5961.

[Freagarach]

Sounds like a duplicate of #5500? (Also pushing back no next cycle.)