Text should not be shown as its string representation. However, when truncating NBT display text, the ellipsis is stringified.

To reproduce, run /data get entity @s when you have a lot of recipes pending display in the recipe book.

Code analysis (Yarn mappings)

Refer to the NbtTextFormatter#visitList and NbtTextFormatter#visitCompound methods:

// ELLIPSIS is a Text instance
this.result.append("[" + ELLIPSIS + "]");

The issue seems to have first appeared in Minecraft snapshot 24w19a, presumably from the fix for MC-270779.