Fix an issue in footprint simulation and add some test coverage for i… #4333

Job	Run time
fmt	9s
cackle	1m 16s
cargo-deny (advisories)	44s
build-and-test (msrv, 22, ubuntu-latest, wasm32-unknown-unknown, false)	8m 52s
check-git-rev-deps	6s
cargo-deny (bans licenses sources)	41s
build-and-test (msrv, 22, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	18m 38s
build-and-test (latest, 22, ubuntu-latest, wasm32-unknown-unknown, false)	8m 52s
semver-checks	4m 18s
build-and-test (latest, 22, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	18m 31s
publish-dry-run (ubuntu-latest, wasm32-unknown-unknown) / publish-dry-run / publish-dry-run	41m 16s
publish-dry-run (ubuntu-latest, x86_64-unknown-linux-gnu) / publish-dry-run / publish-dry-run	41m 16s
complete	1s
	2h 24m 40s

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