Does pushing back flatulence invalidate wudu' if it occurs immediately after finishing it, with the fear of wasting time if it is repeated?

Whoever intentionally prays while suppressing the two impurities (urine, feces, and gas), their prayer is valid according to the majority of scholars, but it is disliked for them to do so intentionally. It is better for someone who experiences the urge to pass gas before prayer to relieve themselves and renew their ablution, as this helps in achieving devotion (khushu'). The time spent doing so is not considered wasted; rather, it is an act of obedience. If one prays while suppressing gas, their prayer is valid, though disliked.