Errors when under heavy use

[colinmacdonald]

Uncaught HierarchyRequestError: Failed to execute 'insertBefore' on 'Node': Nodes of type 'HTML' may not be inserted inside nodes of type '#document'. platform.min.js:2

Uncaught TypeError: Cannot read property 'parentNode' of null rich-text-editor.min.js:6

This is getting spammed in the console:

Trying to apply delta to incorrect doc length 
a {startLength: 70, endLength: 71, ops: Array[2], apply: function, applyToText: function…}

n {startLength: 0, endLength: 71, ops: Array[38], savedOpIndex: 38, savedOpOffset: 71…}

[colinmacdonald]

A larger sample of the delta to incorrect doc length logs: