Checking/unchecking tasks very fast on a page gives error

Summary

When you have more than one task to check/uncheck in the same page it may be reasonable for you to click all of them very fast, one after the other. And when we do this fast check/uncheck of tasks in the page it will throw an error at some point and the task won't be checked/uncheked.

Steps to Reproduce

1. Add some tasks to a page and save the page
2. Start checking them one by one very fast

Expected Results

The checks/unchecks are saved.

Actual Results

At some point this will throw an error on top of the page:

Oops! Your task change couldn't be saved. 
There could be a few reasons for this. Dismiss

Checking the browser's console you'll see a 500 error on the POST saying something like

Inline Task #3 was not persisted to CHECKED because of  (status: error)

Notes

This can be reproducible on both old and new look. See screenshots for the errors

Workaround

None