build: build failure on x_tools-go1.23-linux-loong64

[gopherbot]

#!watchflakes
default <- builder == "x_tools-go1.23-linux-loong64" && repo == "tools" && mode == "build"

Issue created automatically to collect these failures.

Example (log):

[W2025-03-26T05:02:21.189488+08:00 3566068 0 json_subtract.go:121] Unknown fields while parsing property namespace "": {"env":{}, "is_google":false, "mode":0}
2025/03/26 05:02:21 run starting
2025/03/26 05:02:41 installed tools

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- builder == "x_tools-go1.23-linux-loong64" && repo == "tools" && mode == "build"

2025-03-25 18:43 x_tools-go1.23-linux-loong64 tools@7efe9a8b release-branch.go1.23@c8551497 [build] (log)

[W2025-03-26T05:02:21.189488+08:00 3566068 0 json_subtract.go:121] Unknown fields while parsing property namespace "": {"env":{}, "is_google":false, "mode":0}
2025/03/26 05:02:21 run starting
2025/03/26 05:02:41 installed tools

— watchflakes