I do not know if this is directly caused my MC-301094 so reporting this separately until we can confirm this detail. This is definitely, however, related to MC-277670.
Uses of the missing glyph should display an error in the log, but in this specific case this does not happen for some reason.
Example command: /tellraw @s {atlas:"invalid_atlas_name",sprite:"anything_can_go_here"}
Expected results would be a log error, actual results is no such error.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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