Every so often I’ll hear stories like this, but over the past 2 years of me doing the monthly transfer, it’s been good for me and if it wasn’t, I’d switch from smartphone app to PC website or wait a day.
I’m a US citizen living in Thailand, and over the past 18 years of flying in/out of Thailand on a one-way ticket, I’ve never been asked about a return ticket from any airline or immigration officer.