LL and KV's points are both valid but I also think its because the movement of the line in Kherson has now flattened out and easier to defend, the movement the other day was the culmination of weeks of probing the line and making incursions into Russian territory until the line eventually collapsed. The Russians have now regrouped to a more stable line with no potential encirclements at the minute. Its a case of rinse and repeat but it could take a few more weeks before weaknesses in the line become apparent. Russia has masses of troops in Kherson so it will be like this for some time, a very stop start campaign.
Current front in Kherson according to Russian blogger (who despite the side he's on, does appear to produce the most accurate maps)
On the was Kharkiv, now Luhansk front. I do think its a case of resupply and recovery. Ukraine are basically up to the P66 Highway, now that road is built on high ground and isn't particularly well defended, the defence is in the towns like Svatove that run parallel and to the East of the highway. Those towns are pretty indefensible and the Russians know it, they haven't fallen yet because they haven't been attacked. When they are attacked the Russians will run. They don't have masses of troops here (because they were all moved to strengthen Kherson) and those towns can be fired on from the relative safety of high ground as they are all built into the leeside of a ridge of hills. Ukraine will take those towns when they are good and ready to.