Any text that exceeds the width of the toast that appears when a resource pack reload fails is cut off. While this doesn't affect English, a lot of translations with longer strings are affected by this.
A few examples (English, French, German, Latin and Polish):
[media]Linked issues
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pine1needle
_Spitz
This might be a duplicate of MC-147983, unless MC-180892 is specifically about resource pack toasts in the menu and MC-147983 is specifically about recipe toasts in the actual game.