It's a design feature, not a bug. The calculation uses:
////////////////////////////////////////////////////////////
//
// alpha-carbon-only secondary structure determination
//
// Levitt and Greer
// Automatic Identification of Secondary Structure in Globular Proteins
// J.Mol.Biol.(1977) 114, 181-293
//
/////////////////////////////////////////////////////////////
However, here is my note in the secondary structure calculation for
C-alpha-only structures:
// throw away the sheets ... their angle technique does not work well
This comment was made sometime before __JmolVersion="13.3.3_dev_2013.07.23"
I recommend that Proteopedia not remove the helix/sheet records.
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