Frogspawn item texture appears to extend into hotbar outline. It is not actually outside the outline, it is just touching the outline shadow, like the nether quartz item.
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Might as well report glass pnes, iron bars, and some of the other 2D block-texture items if they "fix" this/quartz then, let's see when it starts being labeled as invalid...
Would MC-140819 be considered related?
In the case of the lectern though, it actually does extend into the outline and not just into the outline shadow.
Honestly, the better fix (if this is even considered an issue) is removing the shadow, or making it much less prominent, so people stop thinking it is part of the outline.