Investments in equity measured at fair value fail SPPI test because they don’t give rise on specific dates to cash flows that are solely payments of principal and interest on the principal amount outstanding.
The general rule should be the valuation at FVTPL (recognition of any fair value change in PL). However, this IFRS allows, in case of exercise of a specific option, the valuation of investments in equity at FVTOCI (without recycling).