BUG REPORT: Microsoft Excel Table Versioning Incompatibility Breaks Macro Logic

Excel tables now silently behave differently based on internal "versioning" (version 1 vs version 2), which is undocumented, invisible to the user, and directly breaks macros that previously worked across all sheets. There is no native method to identify which version a table is using, and users receive zero warnings when behavioral changes cause critical automation failures.

Impact:

• .ListRows.Count and .ListRows(lastRow).Range.Delete fail inconsistently depending on the hidden version type
• Developers are forced to rewrite macros—not for logic reasons, but to compensate for Excel silently violating expected object behavior
• No version flag exposed in the UI, VBA, Power Query, or formula metadata
• Breaks trusted workflows for trainers, dashboard builders, and automation developers—especially during live sessions or instructional demos
• Forces users into non-consensual, destructive workarounds like converting the table to a range and rebuilding it from scratch. This should never be necessary. A user should not have to destroy a structured object to restore its usability.

Repro Steps:

1. Create a table via "Insert > Table" (defaults to version 2 silently)
2. Copy data from older workbook sheets (some revert to version 1)
3. Run macro using .ListRows(lastRow).Range.Delete
4. Logic fails, errors, or behaves inconsistently
5. Only workaround: convert table to range and rebuild—which is professionally unacceptable

Temporary Workaround:
On Error Resume Next
With ActiveSheet.ListObjects(1)
Dim lastRow As Range
Set lastRow = .ListRows(.ListRows.Count).Range
If Trim(lastRow.Cells(1, 1).Text) = "" Then lastRow.Delete
End With
On Error GoTo 0

Call to Action: Microsoft must publicly acknowledge the undocumented and silent divergence in structured table behavior between internal “version 1” and “version 2” implementations.

This regression has:

• Broken established VBA logic
• Caused hours of untraceable macro failures
• Forced users into destructive workarounds
• Undermined trust during live instruction, client deliverables, and advanced workflow design
• Provided no way for users to identify table version—this is unacceptable

We demand:

• Full disclosure of structured table version differences—what changed, why, and when
• Visible version metadata in Excel’s UI, VBA object model, and Power Query
• Behavioral standardization across workbook sources and creation methods
• Permanent removal of forced workarounds like converting tables to ranges just to restore row deletion logic
• Public bug tracking, resolution timeline, and community updates

If Microsoft cannot provide these answers, then Excel structured tables must be considered unstable containers for automation. Developers and trainers cannot build trusted systems on invisible rules and undocumented regressions.