Also - I have confirmed something from the discussion with @cuddly-garage-87447 - We have several BUILD files under 3rdparty, so

3rdparty/BUILD.foo

and

3rdparty/BUILD.bar

. If I move a jar dep from

BUILD.foo

to

BUILD.bar

the VTS that manages all the jar targets is invalidated! The jars are sorted before being processed by the VTS. This has a strong chance to not be a Pants bug but an oversite in our custom resolver. But it closely mirrors what backuist was reporting, so mentioning here. I will try and take some time to dig into this over the weekend perhaps..