The encoder writes a PADDING block of 8192 bytes by default (or 65536 bytes if the input audio stream is more than 20 minutes long).
But the flac.exe encoder also adds padding when encoding. Does dbpoweramp add more than 8 kB of padding ?
I know in dBpoweramp Configuration 4 kB is the default setting for FLAC.
Could it be then that if one were to keep transcoding the same FLAC file over and over again the file would continuously increase in size, with a new padding allocation being implemented with each transcode?