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Trigger error when running a flow from a Model Driven App

If you encounter the following screen when triggering a run from a Model Driven App, you likely need to rebuild the whole flow (the trigger action gets somehow corrupted): 

Error: The input body trigger ‘manual’ of type ‘Request’ did not match its schema definition. 
Error details: Expected String but got Null
This has now happened to me a couple of times, and I’m not exactly sure, but to prevent this from happening, you should always add as a first step a Get a row by ID action before building the rest of the flow. I’m unsure why this keeps happening, and I struggle to remember that this proxy step is required.
I found the solution to this problem here: so it looks like this issue has been around for a while now.

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