fix compat breaking: revive workaround padding in decode() #3112

Job	Run time
rust-integration-test-strategy-matrix	1s
rust-unit-test	5m 45s
rust-lint	3m 0s
shellcheck	10s
validate-cargo-lock	21s
actionlint	13s
build-and-test-java-api (windows-latest)	7m 18s
build-and-test-java-api (macos-latest)	2m 30s
build-and-test-java-api (ubuntu-latest)	3m 6s
build-and-test-python-api (windows-latest)	9m 21s
build-and-test-python-api (macos-latest)	3m 35s
build-and-test-python-api (ubuntu-latest)	3m 2s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 45s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 40s
build-windows-cpp-example	4m 54s
c-header	43s
rust-integration-test (macos-12)	2m 24s
rust-integration-test (ubuntu-20.04)	1m 35s
	51m 23s

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