We had this happen, even after using tons of water to flush. Most toilets drain into tank through and elbow pipe- almost 90 degrees. To fox ours we had a remote repair come in and he sed a bubble tool on the end of a hose to clear. Everyday snakes will not work on the issue.
We made a change and stopped flushing toilet paper. Saved water and reduced cloggs and paper into the black tank.
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