The The XML TBX format pages and a number of other aTbref notes have been updated.corrected. Including the default for $Color that changed to ‘7’ in v8.
I missed the latter as I find the new defaults to indistinct compared to the old v7 standard, which I find better for outline use which is the only view I use for writing/maintaining aTbRef’s. By comparison, for most other uses, the current defaults are just fine. But changes like new colour default colour schemes silently changing the effective app default $Color, such changes often fail to get noted in release notes.