Ice block not shown after Dreamplanner Zephrys gave it (standard mode)

[Xylar7]

Expected Behavior

When an opponent (shaman) played Dreamplanner Zephrys and they got Ice Block from it and played it, I think HDT should show that Ice Block was actaully a possible secret hidden out there.

Actual Behavior

HDT showed 5 possible secrets, none of which was Ice Block. I believe the only ones shown were the current standard mage secrets (not 100% sure they were all mage's), while as far as I checked, the card Dreamplanner Zephrys can give you any 'Legacy' card which includes cards that are not currently in standard.

Steps to reproduce behavior

No response

Log/Screenshots

Turn 5 seen in the replay: https://hsreplay.net/replay/mSpdomaYNxNQRfNsyShT2C