Which version of Photoshop and which OS?
Adobe Photoshop Version: 19.0 20171103.r.190 2017/11/03: 1143799 x64
Operating System: Mac OS 10.13.1
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This is a known issue in the current version of Photoshop. Adobe staff are aware.
See this link for more detail:
In the meantime if you need PNG export you can re-install CC2017 from the desktop app (older versions can co-exist on the same PC) and use that when you need to render the PNG image sequence.
Thank you so much
You're welcome. :-)