@vcsjones @renchap oooh interesting. Seems very similar to the bug we experienced when upgrading to Xcode 16, where it only appeared in Release builds!
The bug we had in the GitHub app was related to Fuzi using UnsafeBufferPointer(rebasing:) rather than passing the C string buffer directly to libxml2.
https://github.com/cezheng/Fuzi/blob/e853de3bdeb6fd458bcab6daa4d56e68ff80c531/Sources/Document.swift#L98-L112
We worked around this by calling the initializer that passes the C string buffer to libxml2 directly.
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