I have been having issues with hopper minecarts randomly stopping on rails. The rails are properly powered and there is no reason why the minecarts should be stopping. Sometimes the minecarts even come off of the rails.
Unfortunately, I can't add a visual example, because I have never seen it happen before. I just go into the hopper system and everything is broken. Maybe this has something to do with chunk loading?
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Minecarts and other moving entities will generally stop (and can even despawn) at the borders of unloaded chunks. Many players will either carefully build their minecart system entirely within one chunk, or will use an on-off system, so that when they move away from the area the minecarts will work as expected.
Have you ensured that the tracks do not cross into unloaded chunks?
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Minecarts and other moving entities will generally stop (and can even despawn) at the borders of unloaded chunks. Many players will either carefully build their minecart system entirely within one chunk, or will use an on-off system, so that when they move away from the area the minecarts will work as expected.
Have you ensured that the tracks do not cross into unloaded chunks?
This report has been temporarily resolved as Awaiting Response. It will automatically reopen when you comment with new information. Please provide all requested information. Reports that do not contain enough information may be closed as Incomplete.
Many players find this Bug Report Creation Form useful for filling in all helpful information.

As of 1.21.20 hopper minecarts are stopping for no reason whilst on active powered rails whilst the chunk is loaded.

I am having this same problem on Bedrock 1.21.21 as of today (17 August 2024).
I have rail that is within a single chunk (does not cross chunk boundary) and is repeatable with me in the chunk watching it happen (IE - I do not log out or leave the chunk in order to trigger the effect of the minecart stopping). Further - I tested riding the minecart and attempting to push forward (up arrow) to get past the affected block and the minecart would not move. I appear to have several blocks affected by this issue within the same chunk. At first I though this affect was because the rails were underwater, however I drained the area and recreated the problem without the water (IE on dry rail).

I am having this same problem on Bedrock 1.21.21 as of today (17 August 2024).
I have rail that is within a single chunk (does not cross chunk boundary) and is repeatable with me in the chunk watching it happen (IE - I do not log out or leave the chunk in order to trigger the effect of the minecart stopping). Further - I tested riding the minecart and attempting to push forward (up arrow) to get past the affected block and the minecart would not move. I appear to have several blocks affected by this issue within the same chunk. At first I though this affect was because the rails were underwater, however I drained the area and recreated the problem without the water (IE on dry rail).

We are now tracking this issue at MCPE-185643, so I am resolving this report a a duplicate.