Unfortunately it appears this bug is still out there.
I transferred 565 Kej twice in row, back-to-back, between the same two characters. The first transfer was successful but the second was not.
I’ve experienced currency transfers failing before, and normally just try again until it works. This time I took a portal after initiating the second transfer again and it took the Kej but didn’t deposit it on the second character.
It’s just 565 Kej, so I’m not that upset about it, but figured it was worth reporting.