This issue was introduced in 2024.1.0. I corrected it today. Thank you for reporting it.
If an upgrade is possible, the version of LOAD DATA in IRIS 2022.3 has many bug fixes and improvements.
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This is technically a defect that we should correct.
Note that for some storage models the data is deleted. For example, if the column uses Columnar Storage instead of Row Storage, the data is deleted.