Issues with setting NFS client acdirmin=0

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In RHEL 6.x I used to be able create NFS client shares (/etc/fstab) with the the options
acdirmin=0,acdirmax=0

Now when I do that in 7.5, 7.6, and 7.7 I have processes that hang (CPU goes to 99%) when they try to access files on those shares.

Does anybody know of anything that might have changed between 6.x and 7.x to cause this problem?