Copy-Pasting text that contains a table will crash the site

[jackahl]

Describe the bug Copy-Pasting text that contains a table will crash the site

To Reproduce Steps to reproduce the behavior:

1. Go to https://6.demo.plone.org/add?type=Document
2. Copy the Release history table including its headline from https://en.wikipedia.org/wiki/Plone_(software)#Release_history
3. Paste into a new text Block --> Error

Expected behavior A text Block with the headline and a separate table block should be created

Screenshots

Software (please complete the following information):

• OS: Ubuntu 20.04.5 LTS
• Browser Firefox, Chrome
• Volto 16.0.0-alpha.30
• Plone 6.0.0b1
• plone.restapi 8.25.1

Additional context related to #3626

[jackahl]

@tiberiuichim @razvanMiu This should probably be fixed together with #3626