We use AspNetCore.SassCompiler for dynamic/runtime sass compilation. This usually works fine, but one on installation we get a strange error when the web application attempts to start:

InvalidOperationException: No process is associated with this object. [...] at AspNetCore.SassCompiler.SassCompilerHostedService.Dispose()

Anyone seen this? It may not be related to Umbraco, but we're only using AspNetCore.SassCompiler in Umbraco, so we don't have anything to compare with. The sass compiler (and Smidge) is configured exactly like in working installations and the Startup/Program code is also the same. Tried both 32-bit and 64-bit for the web app (running in Azure). If we remove AspNetCore.SassCompiler, Umbraco starts fine. Umbraco 12.latest.