Got an email on 01/23/2020 that the defect has been patched with the following patches:
Update 37 - OES 2015 SP1 - iPrint - Recommended (Open Enterprise Server 2015.1 (OES 2015 SP1) x86-64)
iPrint 3.2 Patch 4 (iPrint Appliance 3.0 x86-64)
Update 12 - OES 2018 - iPrint - Recommended (Open Enterprise Server 2018 x86-64)
Update 4 - OES 2018 SP1 - iPrint - Recommended (Open Enterprise Server 2018.1 x86-64)
iPrint 4.0 Patch 4 (iPrint Appliance 4.0 x86-64)
So I removed the workaround that had been previously suggested, restarted Apache2, verified that the problem existed, installed patches, restarted Apache2, verified that problem was fixed.