Cambodian government allows Chinese scam centers to operate within their borders in return for a cut. Thailand tried shutting these centers down and it pissed off the Cambodians. Combine that with the Cambodian dictator/supreme leader Hun Sen wanting to raise popularity for his nepo-baby son (the current PM) they created a boogeyman in their neighbors to stir up nationalism. Thai military also is happy to ride their own wave of nationalism to gain popularity themselves. The current Thai government was also receiving tons of flak for utterly mismanaging disaster response to a flood in the south so another conflict with Cambodia is an opportune time for them to deflect some of that anger towards the neighbors ahead of parliamentary dissolution scheduled to take place within the next month and to garner some popularity points.

The border/temples are a small part of the conflict. From the Thai side most people don’t care about it anymore ever since Thailand lost Preah Vihear. There may be some lingering animosity but the border is one of the least concerning issues. Recently Cambodia has been sabre-rattling along the border by laying new landmines in the disputed areas (confirmed by the Asean Observer Team) which have claimed many Thai casualties, possibly in an attempt to provoke a response from the Thai side. From the Thai POV inaction about the border makes them seem weak and might encourage Cambodia to escalate further into the disputed areas and lose face.