I have disputed two tickets booked at the same time on the same PNR (LHR to VIE after Austria closed the border for UK citizens); flights with Austrian. Austrian cancelled my flights and was able to press the 'refund' button on the LH web page but have never received anything (they were not able to calculate my refund + I have filed a claim via an Austrian Airlines online form 4 weeks ago but haven't heard anything so far).
Interestingly my ticket was refunded immediately, my wife's ticket is still under investigation (charge back claimed about 2 weeks ago). So got 50% of the original price back and waiting for the rest.