File System Warnings from backup jobs

Possibly, but it’s probably not in Duplicati, so the only Duplicati option is to seek workarounds.

Quoting you, this has no response. If .NET can’t handle, Duplicati using .NET might not either:

What do you mean by .NET, if you know? Both PowerShell and Duplicati .NET versions may vary.
.NET Framework is rather stagnant, but I “think” default PowerShell runs it. Duplicati 2.0.8.1 does.

Duplicati 2.0.9.x (now in Canary test releases) uses .NET 8 which is multiple years more updated. Canary releases are usually not advised for production, but maybe you can try it on a test system.