Enterprise: Style of read-only Text Input field has changed in Light Theme

Describe the bug
Between version 4.8 and 4.9, the text colour used within read-only text fields has changed, but only in the Light Theme. To compare...

To Reproduce
https://design.infor.com/code/ids-enterprise/4.8.0/demo/input/example-index?font=source-sans
https://design.infor.com/code/ids-enterprise/4.9.0/demo/input/example-index?font=source-sans

I can see nothing in the release notes that implies this is deliberate and the new style essentially makes the read-only text look disabled, and definitely much more difficult to read. We use this style extensively in our Infor ERP applications, and the new style has effectively made the fields unusable in the default theme, and is therefore preventing us upgrading to the latest release of SoHo Xi to take other fixes we need.

Expected behavior
Can we have a fix, or, if this style change is deliberate, then can we have a alternate read-only class to go back to the original styling?

Screenshots
n/a

Platform
Reproduced using MS Windows 8.1, with Chrome, FireFox and IE11 (latest versions of all browsers).