I made modifications to the project gr-APRS - A GNU Radio Block for Receiving APRS at
https://handiko.github.io/gr-APRS/to work with GNU-Radio 3.10.2.0 on Ubuntu 22.04
Below are screenshots of the flow graph and output. The PDU vector contents are visible lower left and AX.25 packet on bottom.
Note: A modification is needed to the software that converts from HDLC to AX.25 to avoid the error "Unexpected stop of address section"