Pasting text into Business Model Canvas Cards gives character count error

Issue Summary

This is reproducible on Data Center: yes

Steps to Reproduce

1. Go to the Business Model Canvas page.  Create a new or edit an existing business model
2. Rearrange the cards in the grid at least once by drag and dropping a card to a different position.
3. Select some text (less than 750 characters) and copy it into your clipboard
4. Open one of the business cards and paste the text into it.  Click save.

Expected Results

The card should save with no errors

Actual Results

An error appears saying "Description:  Text length exceeded - 750 Characters".

Workaround

If you click the save button a second time, the error goes away and the card successfully saves.