You may have to show PROOF of your DTV Visa to airline staff on check-in for your flight ✈️ to Thailand...even to the connecting airline staff. Or to the land border crossing entry Thai Immigration Officer.
Upon arrival into Thailand, show the DTV visa to the Thai Immigration Officer and look at the STAMP placed in your passport to be sure you are STAMPED in for 180 days.
it's up to the Thai Immigration Officer. That's why it's wise to use a border bounce service company. They have you out and back the same day or next day if unable to use a Cambodian border crossing. They pre-clear your passport before doing a border bounce.