problem
A master can leave your DAW clean and still clip after streaming encoding changes the waveform.
Codec clipping shows up when a master that passed in the DAW turns brittle, gritty, or splashy after upload. The file did not need to hit 0 dBFS inside the session for this to happen.
Lossy codecs rebuild the waveform during encoding and playback. That process can create extra peak level, especially on loud masters with bright transients or heavy limiting.
A sample peak ceiling only proves that the stored samples stayed below the limit. It does not prove the reconstructed or encoded signal will stay below the same point.
True peak metering gives a better warning because it estimates level between samples. If the true peak is already close to full scale, codec conversion has very little room to move.
Check the final master with true peak enabled and leave enough ceiling for the platform or file format you expect. A -1 dBTP ceiling is a common starting point for streaming delivery.
Meter Core puts LUFS and true peak in the same view so you can avoid chasing loudness at the cost of encoded playback quality.