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Simple reproducer (does not need to run in ksh emulation mode):

"""
$ cat toto.sh
#!/usr/bin/ksh

typeset -A person
person[firstname]="frank"
person[lastname]="jones"

echo "person: ${person[firstname]} ${person[lastname]}"
"""

if run:

$ zsh -n toto.sh
toto.sh:7: bad substitution

Bisecting zsh upstream, the problem is corrected in commit
https://sourceforge.net/p/zsh/code/ci/a0862f6381979b165e864e9c5b97d12432d35d48/

Thank you for identifying the upstream commit with the fix for this bug!

I can confirm that it resolves the issue and it should be safe to backport.

Verified.
Reproduced on version: zsh-5.0.2-25.el7.x86_64
Verified on version: zsh-5.0.2-28.el7

Old output: ./repr.sh:7: bad substitution
New output: <empty>

TCMS case run:
https://tcms.engineering.redhat.com/run/304641/#caserun_15218383

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1955