Custom action for custom slot mapping sanic error

[nik202]

@Horizon733 can you try this:

sanic==21.6.0
Sanic-Cors==1.0.0
sanic-jwt==1.7.0
sanic-plugin-toolkit==1.2.0
Sanic-Plugins-Framework==0.9.5
sanic-routing==0.7.0

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