BUG: Fix dt64[non_nano] + offset rounding

Author: Aniketsy

pandas/core/arrays/datetimes.py

@@ -72,6 +72,8 @@
 from pandas.tseries.frequencies import get_period_alias
 from pandas.tseries.offsets import (
     BusinessDay,
+    BusinessHour,
+    CustomBusinessHour,
     DateOffset,
     Day,
     Tick,
@@ -838,6 +840,8 @@ def _add_offset(self, offset: BaseOffset) -> Self:
                 and offset.offset is not None
                 and not isinstance(offset, Tick)
                 and type(offset) is not BusinessDay
+                and type(offset) is not BusinessHour
+                and type(offset) is not CustomBusinessHour
             ):
                 offset_td = Timedelta(offset.offset)
                 if offset_td.value != 0: