addColumns throws an error with AlwaysDense address mapping with empty values

Calling addColumns does not work with the address mapping option AlwaysDense but works with AlwaysSparse. An error is only thrown when using buildEmpty as opposed to using buildFromArray. The test also appears to fail even when inserting columns into an index other than 0 so long as there are empty cell values in the index of the column that is being inserted.

Build Empty

Test with "AlwaysDense" throws an error
Test with "AlwaysSparse" succeeds

const engine = HyperFormula.buildEmpty({ chooseAddressMappingPolicy: new AlwaysDense() });
engine.addSheet();
engine.setCellContents({ col: 0, row: 0, sheet: 0 }, 1);
engine.setCellContents({ col: 0, row: 1, sheet: 0 }, 2);
engine.setCellContents({ col: 0, row: 5, sheet: 0 }, 5);
engine.addColumns(0, [0, 1]);

Error:

TypeError: Cannot read properties of undefined (reading 'splice')
 ❯ DenseStrategy.addColumns node_modules/hyperformula/commonjs/DependencyGraph/AddressMapping/DenseStrategy.js:153:45
 ❯ AddressMapping.addColumns node_modules/hyperformula/commonjs/DependencyGraph/AddressMapping/AddressMapping.js:278:20
 ❯ node_modules/hyperformula/commonjs/DependencyGraph/DependencyGraph.js:809:31
 ❯ EmptyStatistics.measure node_modules/hyperformula/commonjs/statistics/Statistics.js:114:20
 ❯ DependencyGraph.addColumns node_modules/hyperformula/commonjs/DependencyGraph/DependencyGraph.js:808:18
 ❯ Operations.doAddColumns node_modules/hyperformula/commonjs/Operations.js:1152:57
 ❯ Operations.addColumns node_modules/hyperformula/commonjs/Operations.js:315:16
 ❯ CrudOperations.addColumns node_modules/hyperformula/commonjs/CrudOperations.js:139:23
 ❯ HyperFormula.addColumns node_modules/hyperformula/commonjs/HyperFormula.js:1577:66

• HyperFormula version: 2.0.0
• Operating System: MacOS M1

When using build from array both address mapping options succeed

const engine = HyperFormula.buildFromArray([[1], [2], [], [], [], [5]], {
    chooseAddressMappingPolicy: new AlwaysDense(),
});
engine.addColumns(0, [0, 1]);