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Which JetBrains slack provides product support? Is that new? If you mean the "JetBrains platform" one, that is for plugin development questions and if you ask product support questions you are most likely redirected to the support page.

Sorry, no MCVE for this. I’ll see about creating one when I have time. I’d like to not have to use substitution, but am in situation where it’s either that or a ton of code duplication as our packaging logic is needed at runtime, but also for our buildSrc. To get the build order correctly, the only way I could find was to do it this way. But then you haven’t heard of this being a general problem at least?

No, I didn't. But I guess most often composite builds are used without manual substitution rules, so it could very well be a problem when using them that just not bubbled up.

I managed to create a MCVE where I could reproduce some issues, not sure if you are interested in trying them out yourself though. https://github.com/FritjofH/CompositeSubstitution Otherwise I’ll go ahead and submit it to JetBrains at some point tomorrow.