Fix bug in `ReadAdapter` #1384

Job	Run time
Light checks	34s
Check prover and winterfell packages	58s
Build for no-std (stable)	31s
Check all features and all targets against the MSRV, except for winter-prover and winterfell	2m 8s
Build for no-std (nightly)	36s
Test Rust stable on	49s
Test Rust nightly on	54s
	6m 30s

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