Our Siemens electrical panel has two single pole 15 amp QP type breakers, with a handle tie that are together powering a mini-split HVAC system. One breaker has the white neutral line into it (wrapped in black tape as appears to be expected) and the other has black hot line.
Can I replace these with a tandem 15 amp QT type Siemens breaker (edit: specifically, model Q1515U)? Assuming I use a handle tie (model ECQTH2, which it looks like qualifies as a common trip for those breakers) and wire it with the same neutral line in one and hot line in the other.
Edit: fwiw, this panel does support tandems in every slot
Photo of the current breaker if it's helpful: