At first I thought maybe this had to do with our add-ons, but I was able to reproduce this with the simplest of examples from EE Docs:
{exp:channel:form channel="main" return="contact/thanks"}
<input name="title" type="text">
<input name="my_custom_field" type="text">
<input type="submit" value="Submit">
{/exp:channel:form}
I get 2 JS errors that say:
Uncaught ReferenceError: FluidField is not defined
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