fix: `ChainReader` fails on `find_intersect_point` without agency #6652

All 1 157 tests pass in 9m 1s

4 files ±0 52 suites ±0 9m 1s ⏱️ +9s
1 157 tests ±0 1 157 ✅ ±0 0 💤 ±0 0 ❌ ±0
1 323 runs ±0 1 323 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit 8f88564. ± Comparison against earlier commit eda8aa5.