Reported on Curse; Confirmed on Retail.

From testing, macro items still work on Wrath Classic

I suspect Macros are no longer counted as Spells in the Retail TooltipDataProcessor system.

Macros are tooltipType 25 (Enum.TooltipDataType.Macro = 25), we need a new handler for Macros (will only be used where TooltipDataProcessor is used, i.e. currently only Retail)

Digging into the data structure provided, there appears to be a hidden first line containing extra info:
lineIndex = 0
leftText = "" -- so it doesn't get displayed
tooltipID = [spell or item ID]
tooltipType = 0 (item) or 1 (spell) - hopefully this follows Enum.TooltipDataType if we need other types

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