merging two documentation archives failing with reports of overlapping data (Swift 6.2)

[heckj]

Description

Using article-only docc catalogs, I attempted to merge two archives that I created to provide a combined collection for publication with a GitHub hosting solution.

However, the docc merge command failed, reporting overlapping content.

In the example that I created to illustrate this, the report is:

Error: Input archives contain overlapping data

'anotherexample.doccarchive' and 'example.doccarchive' both contain '/data/documentation/documentation/'

So this is possibly related to #1321

Checklist

• If possible, I've reproduced the issue using the main branch of this package.
• This issue hasn't been addressed in an existing GitHub issue.

Expected Behavior

docc merge should generate a new, combined archive that can be presented for static hosting

Actual behavior

Error: Input archives contain overlapping data

Steps To Reproduce

git clone https://github.com/heckj/article-only-docc
cd article-only-docc
xcrun docc convert Example.docc -o example.doccarchive
xcrun docc convert AnotherExample.docc -o anotherexample.doccarchive
xcrun docc merge example.doccarchive anotherexample.doccarchive

Swift-DocC Version Information

6.2.1

Swift Compiler Version Information

Apple Swift version 6.2.1 (swiftlang-6.2.1.4.2 clang-1700.4.4.1)
Target: arm64-apple-macosx26.0
/Applications/Xcode-26.1-beta2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-help intro