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While validating a workflow: Unable to contact server.

While using workflow builder (v16.2) I have one workflow that when I try to validate or save to TeamSite it complains that it's "Unable to contact server". It's just kidding because other workflows validate and save just fine.

Soooooo... I open the developers window and watch the network traffic. The response to the call to /iw-wfm/action/wfmValidateModel is:

Request Entity Too Large
The requested resource
iw-wfm/action/wfmValidateModel
does not allow request data with POST requests, or the amount of data provided in the request exceeds the capacity limit.

The workflow has 38 steps, I'm not sure how many path's there are. I obviously saved it once since this is one of our primary workflows.