Fix last_index_position value on segment load #900

Job	Run time
sanity / Check	2m 54s
sanity / Test documentation	3m 25s
sanity / Clippy	3m 49s
sanity / Validate commit messages	5s
sanity / Rustfmt	9s
sanity / Sort dependencies	31s
sanity / Unused dependencies	51s
build and test macOS-aarch64	2m 39s
build and test Linux-x86_64-musl	4m 43s
build Windows-x86_64	3m 57s
backwards_compatibility / check_commit_message	7s
backwards_compatibility / build_and_test	1m 37s
finalize_pr	1s
	24m 48s

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