fix compat breaking: revive workaround padding in decode() #3092

Job	Run time
rust-lint	1m 50s
actionlint	17s
validate-cargo-lock	25s
shellcheck	15s
build-and-test-java-api (windows-latest)	5m 17s
build-and-test-java-api (macos-latest)	3m 1s
build-and-test-java-api (ubuntu-latest)	2m 44s
build-and-test-python-api (windows-latest)	9m 21s
build-and-test-python-api (macos-latest)	3m 53s
build-and-test-python-api (ubuntu-latest)	3m 4s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 48s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 38s
build-windows-cpp-example	4m 17s
c-header	48s
rust-integration-test-strategy-matrix	1s
rust-unit-test	3m 54s
rust-integration-test (macos-12)	3m 23s
rust-integration-test (ubuntu-20.04)	1m 26s
	47m 22s

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