Agilex 5 dual simplex fitting

Hello all.

In my project I have to implement HDMI input and HDMI output.

As a starting point I took an example design, which is generated from HDMI IP core.

This example uses the dual simplex to place input and output to the same transciever block (bank 4C).

By default the rx component has an offfset 1 in dual simplex group:

Do not pay attention to the second DS_Group, it is not used in the code.

This project can be successfully compiled.

I work with quartus 25.1 Pro.

Due to some reasons, this dual simplex configuration is not suitable for my project. I need rx offset = 0,

like in the picture:

I save this config, regenerate HSSI Dual simplex IP, reassign pin locations for rx, so they occupy channels 0 - 2. All the rest assignments stay unchanged.

In that case the fitter is not able to succeed.

Then I've removed all pin assignments to allow the fitter to find the right place by itself. But it still is not able to fit.

At the other hand, the Quartus 24.2 was able to do this. But when I take pin assignments from q24 (which were successfulluy fit) and give them to q25, it is still not happy.

Has someone any ideas, how to fit my configuration?

Than you.