Describe the bug
When using languages.python.uv.sync.enable = true and languages.python.venv.enable = true the devenv:python:virtualenv task, that runs after devenv:python:uv recreates the virtualenv with uv venv $DEVENV_STATE/venv.

The behavior only appears initially when the virtualenv is created. When reloading the shell the virtualenv is not recreated, because it already exists and uv sync is run again, because the uv.sync.checksum file was deleted.

Expected behavior
When setting both options the virtualenv should only be sourced and not recreated.

To reproduce
The following test exhibits the same problem:

However for some reason the test itself passes when run with devenv-run-tests --only python-uv-sync. To reproduce the problem run cd tests/python-uv-sync && ../../result/bin/devenv shell:

$ python -c 'import requests'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'requests'

Version

devenv 1.3.1 (x86_64-linux)

Also tested with f8be0ed and with uv 0.5.29 (unstable) and 0.4.30 (rolling).

Related: #1626