Since the change #124558, cache flutter version to disk, running flutter update-packages is causing an error

The cached version seems to be handled in a place where the output of a git describe is expected,
and that output would additionally have a partial commit hash at the end. The regexp parsing expects it to be there.
This error is in [flutter]/packages/flutter_tools/lib/src/version.dart:990.

I'm not sure if this is causing other problems or not. I am running tests in a checkout of framework with engine.version overwritten by a monorepo commit hash, and a custom FLUTTER_STORAGE_BASE_URL

/src/flutter$ bin/flutter update-packages -v
[ +13 ms] Could not interpret results of "git describe": 3.12.0-4.0.pre.114

but

/src/flutter$ git describe --match ..* --long --tags HEAD
3.12.0-3.0.pre-114-g323c296922

I am also uncertain where the 3.12.0-4.0 version number is coming from, since I don't see the number 4 on git or anywhere
in files called "version" that are checked in.