List of steps to reproduce

• Create form in MW 1.36 with multiple field and wikitext field inside
• Add table to this field
• add table caption to table
• Save
• edit the page again
• save

What happens?:

Form not submitted, and you'll get waring you can't use pipes in VE

What should have happened instead?:
Pipe of table caption should escape automatic and form saved.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc:
MW 136