Fix `col_labels` bug for named label attributes #808

All 190 tests pass, 2 skipped in 2s

1 files ±0 14 suites ±0 2s ⏱️ ±0s
192 tests ±0 190 ✅ ±0 2 💤 ±0 0 ❌ ±0
263 runs ±0 261 ✅ ±0 2 💤 ±0 0 ❌ ±0

Results for commit 1e1d6b9. ± Comparison against earlier commit e5ea2c5.