Update: Now this does affect 19

On experimental and trunk, when the student enters a valid number for a numeric question, a pop-up displays: Please use only accepted characters within numeric response fields.

The numeric answer is then wiped out.

There are a lot of warnings in the browser console:

Firefox:

Loading failed for the <script> with source "https://trunk-mysql.nightly.sakaiproject.org/library/webjars/mathjs/6.0.2/dist/mathjs.min.js?version=f5bcda44". beginTakingAssessment:1376:1
The script from "https://trunk-mysql.nightly.sakaiproject.org/library/webjars/mathjs/6.0.2/dist/mathjs.min.js?version=f5bcda44" was loaded even though its MIME type ("text/html") is not a valid JavaScript MIME type.
deliverAssessment
Loading failed for the <script> with source "https://trunk-mysql.nightly.sakaiproject.org/library/webjars/mathjs/6.0.2/dist/mathjs.min.js?version=f5bcda44". deliverAssessment:1376:1

Learn More link
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options

Chrome:

headscripts.js:807 GET https://trunk-mysql.nightly.sakaiproject.org/library/webjars/mathjs/6.0.2/dist/mathjs.min.js?version=f5bcda44 net::ERR_ABORTED 404
includeWebjarLibrary @ headscripts.js:807
(anonymous) @ beginTakingAssessment:1331

headscripts.js:807 GET https://trunk-mysql.nightly.sakaiproject.org/library/webjars/mathjs/6.0.2/dist/mathjs.min.js?version=f5bcda44 net::ERR_ABORTED 404
includeWebjarLibrary @ headscripts.js:807
(anonymous) @ deliverAssessment:1331