BUG: Cannot create third-party ExtensionArrays for datetime types · Issue #34986 · pandas-dev/pandas (original) (raw)

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Description

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Code Sample: #34987

Problem description

With #33400 type checks now fasttrack on the kind of the dtype. Thus for every ExtensionDtype that is of kind M, is_datetime64tz_dtype returns True. This is then used in get_block_type which leads to the usage of DatetimeTZBlock for all of these arrays although this block only supports DatetimeArray.