Editing Calendar forms causes a Unable to resolve method 'newEditEngineSubtypeMap'

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Reproduction Instructions
When editing a calendar form to enable viewing of the view/edit fields @reception123 discovered a 'Unable to resolve method ‘newEditEngineSubtypeMap’ error

This looks similar to https://secure.phabricator.com/T12347
Phabricator/Arcanist Version
Output from Config > Version Information or arc version.
phabricator f74f953c7d26b33342de9cb15cd41d652f491cbe (Tue, Aug 20) (branched from 82cf97ad65a910cb55e9c53c3e80f0740a724a10 on origin) arcanist feb5f4d42c4fe0001e76428e80d5e88262308802 (Jun 22 2019) (branched from d92fa96366c0ed50e4257508148aa75192d4fb1f on origin) phutil 8df85007f38ecd06867582fa0539429a3ae83a37 (Wed, Jul 31) (branched from b416093386a225b1d9a2de906899b94cbf4babcb on origin) php 7.3.8-1+0~20190807.43+debian9~1.gbp7731bf diff 3.5 at /usr/bin/diff git 2.20.1 at /usr/bin/git hg Not Available pygmentize 2.2.0 at /usr/bin/pygmentize svn 1.9.5 at /usr/bin/svn

Thanks!

Filed upstream as https://secure.phabricator.com/T13389.

Likely fixed by https://secure.phabricator.com/D20741.

No problem, Thanks for responding so quick as always!