Sheet Cell Content Disappears

1.1 Issue Description

I copied the contents from an Excel spreadsheet into a Tolaria spreadsheet. When I click to edit the spreadsheet and move the focus, the contents of the cells disappear.

1.2 Steps to Reproduce the Issue

1. Open the Excel spreadsheet test_sample_sheet.xlsx in the attachment, select the main content in the spreadsheet, and copy it into the spreadsheet file you created in Tolaria.
2. Double-click to select any cell that contains data. Enter Edit Mode
3. Double-click other cells to edit them

Expected Results The content that was previously in the cell is still there

Current Situation The previous cell contents were cleared

1.3 Test Versions and Systems

Tolaria: Alpha 2026.9.12.1 Computer Systems: Macos 27 (26A428)

1.4 Screenshots as Evidence

Edit Cell:

Content Disapper:

1.5 Related Issue

#1155: Sheet notes on Windows: title becomes the full file path, and cell edits are lost or delete existing content

#1080: Data loss: _display: sheet notes are overwritten with the active editor note's body