When you summon a falling block that is a chest (tested with and without loot table), the falling block won't be rendered at all, including glowing (it doesn't glow if it has "Glowing" tag set to 1b or 1).
Related issues
duplicates
Comments

When you summon a falling block that is a chest (tested with and without loot table), the falling block won't be rendered at all, including glowing (it doesn't glow if it has "Glowing" tag set to 1b or 1).
migrated
(Unassigned)
Unconfirmed
(Unassigned)
1.15 Pre-release 3
Retrieved
WAI, see MC-64634