ERROR: current turn 0 is before first 184

[ennorehling]

Sometimes when running tests (no idea how to reproduce) this happens:
https://github.com/eressea/server/actions/runs/11334448885/job/31520660254

ERROR: current turn 0 is before first 184
ERROR: current turn 26 is before first 184
ERROR: current turn 0 is before first 184
ERROR: current turn 26 is before first 184

  1) Failure (tests.e2.xmas.test_xmastree):
../scripts/tests/e2/xmas.lua:84: expected 0 but was nil