Event Contribution page missing trxn_id in template Contribution.tpl
It seems to depend on whether there was a transaction id set on the initial contribution. If there was one on the initial contribution then I see the refund trxn id on the refund. If there wasn't one on the initial contribution then I don't see a refund trxn id on the refund. This seems to be the same even in 5.5 as well as the public demo.