I reported this over on /r/chromeos for my Duet5 on beta 114 about a week ago but someone there has since confirmed it’s resolved.

My Duet 3 is currently running:

Google Chrome 115.0.5790.18 (Official Build) beta (64-bit)
Revision 298576e169466f6f6f074438c71723e277422f88-refs/branch-heads/5790@{#335}.
Platform 15474.14.0 (Official Build) beta-channel strongbad