Can I exit transit in Istanbul for a long layover before heading to Thailand's Sandbox with a PRC test from Russia?

The question pertains to the feasibility of exiting the transit area in Istanbul during a 19-hour layover for a flight to Phuket, Thailand under the Sandbox scheme. Several comments highlight that if the traveler leaves the transit area and clears immigration, it could complicate their entry process. There are also concerns about whether an RT-PCR test from Russia would be accepted or if a new test from Turkey is required due to the long layover. Ultimately, for travel to Thailand's Sandbox, entering through Bangkok and completing the arrival protocol there is suggested.