Fix Suspense issues on subsequent navigations #806

Job	Run time
get-leptos-changed / Detect Source Change	10s
CI (integrations/utils) / Run ci (nightly)	18m 19s
CI (integrations/axum) / Run ci (nightly)	17m 20s
CI (integrations/actix) / Run ci (nightly)	16m 53s
CI (integrations/viz) / Run ci (nightly)	22m 26s
CI (leptos) / Run ci (nightly)	1h 13m 13s
CI (leptos_config) / Run ci (nightly)	14m 44s
CI (leptos_dom) / Run ci (nightly)	32m 9s
CI (leptos_hot_reload) / Run ci (nightly)	14m 29s
CI (leptos_reactive) / Run ci (nightly)	39m 25s
CI (leptos_macro) / Run ci (nightly)	26m 54s
CI (leptos_server) / Run ci (nightly)	28m 37s
CI (meta) / Run ci (nightly)	17m 34s
CI (router) / Run ci (nightly)	22m 19s
CI (server_fn) / Run ci (nightly)	16m 50s
CI (server_fn_macro) / Run ci (nightly)	14m 26s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	14m 46s
	6h 30m 34s

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