Incorrect flac audio file length after cutting (e.g -ss -to arguments)

[Atg]

OS Win 10 x64. Cutting flac audio files by using "-ss -to" arguments, or splitting by using "-segment_time" results in output files with unchanged audio length (file properties -> details -> length) as the input file. Because of that these files played correctly in audio players, but have broken seekbar.
Just try with attached file:

ffmpeg -y -i test_input.flac -f  segment  -segment_time 2 -segment_start_number 1 -c copy OUTPUT%02d.flac

Or:

ffmpeg -y -i test_input.flac -ss 8 -to 12 -c copy OUTPUT.flac

Occurs in both 20200312-675bb1f version and 4.2.2

[Carl Eugen Hoyos]

Duplicate of ticket #4905 (and ticket #8569).