For JDK-8031767, I provided a patch updating the Jib profiles configuration. That patch was not applied correctly in the final commit. I missed this in the final review and now the linux-x86 profiles are generating a 64bit build.
JDK-8031767Support system or alternative implementations of zlib
JDK-8153303Jib profiles config broken after JDK-8153257 after JDK-8031767