URLs with parameter values with "{" or "}" generate 400 responses

when a url request has a "

" the response is a 400. These urls are being generated by SharePoint when attempting an upload but can be easily be reproduced by sending a url such as "https://somehost/test?Check=

" to undertow. The last version we integrated with where this worked was 1.4.22 (https://github.com/TremoloSecurity/OpenUnison/blob/1.0.12/unison/pom.xml).