How did you verify that is the problem?
claude opus, """ Reproduction (compiler-free) I isolated the mechanism with a tiny project. Identical in every way except the project id. I placed it at /home/sam/tmp/192/repro_bad, with a project id of /home (a path-prefix of that absolute location), versus /notaprefix for the control: Control (/notaprefix, not a prefix): ...found 1 target... — builds fine. Repro (/home, a prefix of the tree's absolute path): error: Unable to find file or target named error: '/home/sam/tmp/192/repro_bad/checks//foo' error: referred to from project at error: '.' error: could not resolve project reference '/home/sam/tmp/192/repro_bad/checks' That is byte-for-byte the same failure shape Matthijs reported, with /home playing the role of /boost. """