[Bug] PX4 cannot maintain altitude in position mode

[serkanMzlm]

Describe the bug

I have a quadcopter drone built with PX4. I fly this drone in position mode using an optical flow and a distance sensor. When hovering, there is no problem, and it maintains its position. However, when I move the drone at a speed of 5 m/s, it continuously descends. Starting at an altitude of 5 meters, after moving 20 meters in the X direction, its Z position drops by about 3 meter, and it cannot maintain a stable altitude. When I stop the vehicle, it slowly climbs back to 5 meters. "In this setup, the altitude sensor is not directly connected to PX4. I read the distance sensor data via Raspberry Pi and publish it as distance_sensor, and I can see this data on QGC. When checking the log, even though the data from the distance sensor is correct, the vehicle appears to be continuously ascending in the Z-axis

To Reproduce

No response

Expected behavior

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Screenshot / Media

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Flight Log

https://review.px4.io/plot_app?log=2bf29ee9-9c62-460e-8b27-317d46bb12db

Software Version

1.15.4

Flight controller

Pixhawk 6C Mini

Vehicle type

None

How are the different components wired up (including port information)

No response

Additional context

No response

[dakejahl]

Similar to #24058

We are investigating and working on fixing this