Last week I got an account statement of the Bamgkok bank of my monthly transfer of 65,000 thb, via Transferwise for my retirement visa extension. At immigration they noticed that my last transfers of January and February had a code stating "transfer of another bank". All other transfers had a code of "inter bank transfer via Smart". This caused them to not accept this last transfers and asked me to show the embassy letter of my income.
I repeated two extra transfers in February and they had each one of the codes. So this is likely to cause problems in the future.