Regex in asserts fails to validate.

I am quite certain this worked in a previous version.

cvc-assertion: Assertion evaluation ('matches(DvString-dv, '[0-9]

-[0-9]

')') for element 'ccd:el-06bf2593-dd8a-4681-a6e5-0470134e632b' on schema type 'ct-06bf2593-dd8a-4681-a6e5-0470134e632b' did not succeed.
Severity
Error

The above assert doesn't validate this string:
<DvString-dv>111-111-1111</DvString-dv>

SaxonEE does validate it. These are both the shipped validators with oXygen 16.0

Interestingly this assert:
<xs:assert test="matches(DvString-dv, '^\d

([\-]?\d

)$')"/>

does validate this string:
<DvString-dv>99999-000</DvString-dv>

There are other examples of these asserts here:
https://github.com/mlhim/tb