bdw429s opened a new pull request, #1234:
URL: https://github.com/apache/poi/pull/1234

   When a table column header contains a newline character (`\n`), 
`updateHeaders()` encodes it as `_x000a_` (the OOXML `_xXXXX_` escape 
convention) before storing in the column definition. However, 
`findColumnIndex()` did not perform the reverse encoding when looking up column 
names, causing lookups against multi-line column headers to always return `-1`.
   
   This fix adds `\n` → `_x000a_` and `\r` → `_x000d_` replacements to the 
`findColumnIndex()` string normalization chain, matching the encoding already 
applied by `updateHeaders()`.
   
   **Changes:**
   - `XSSFTable.java` — `findColumnIndex()` now replaces `\n` with `_x000a_` 
and `\r` with `_x000d_` before looking up the column name in the map
   - `TestXSSFTable.java` — Added `findColumnIndex` assertion to 
`testNamesWithNewLines()` and new `testFormulaWithNewlineColumnName()` test 
that verifies `SUM(Table1[Value\nA])` evaluates correctly with newline column 
names


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