Data conversion from 2014 to 2021 fails on FEATURES table when converting to Firebird.

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Subject pretty much says it all.

2014 data verification completes with no errors.

2021 data conversion succeeds in converting to 2015 bde.

2021 data conversion hangs permanently when converting bde to firebird at the FEATURES table.

I've tried completing this on the server, from a workstation, and from a workstation with a local copy of the DB.  It always fails at the same place.

Can anyone help me out with a hint or even a solution? 

Thanks!