Eeschema 5.99 failing ERC, was successful with 5.1.5

When upgrading my project to 5.99 latest build, the formally successful ERC now fails with "Invalid connection between bus and net items. Not sure if this is a bug in 6.0 or a new feature:

My project is on GitHub and has been updated to 5.99.0-1257 : THS-80

This is my version and environment:
About_Eeschema

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